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Cross+A Puzzles Cross+A can solve and generate many kinds of logic puzzles. The created puzzle can be saved as a graphic file (Windows Bitmap, Windows Metafile, EPS, GIF, JPEG, PNG, PDF, SVG and CorelDRAW formats are supported). Also the batch creating of puzzles is available. Logic Puzzles Kakuro (also known as "Cross Sums", "Kakro") is a logic puzzle, a mathematical equivalent of crosswords. The puzzle consists of a playing area of filled and empty cells similar to a crossword puzzle. Some black cells contain a diagonal slash from top left to bottom right with numbers in them, called "the clues". A number in the top right corner relates to an "across" clue and one in the bottom left a "down" clue. The object of a kakuro is to insert digits from 1 to 9 into the white cells to total the clue associated with it. However no digit can be duplicated in an entry. For example the total 6 you could have 1 and 5, 2 and 4 but not 3 and 3. Hitori (from Japanese "Hitori ni shite kure"; literally "let me alone") is played on a grid of squares. At the beginning, each cell contains a number. The goal is to paint out some cells so that there are no duplicate numbers in any row or column, similar to the solved state of a Sudoku puzzle (except with black squares added to the grid). Orthogonal connections are important as well; paintedout (black) cells cannot be connected orthogonally, and the other cells must be connected orthogonally in a single group (i.e. no two black squares can be adjacent to each other, and all unpainted squares must be connected, horizontally or vertically, to create a single shape). Slitherlink (also known as "Fences", "Loop the Loop", "Dotty Dilemma", "SliLin", "Great Wall of China") is a logic puzzle. It was invented by Nikoli Puzzles in Japan. Slitherlink is played on a rectangular lattice of dots. Some of the squares formed by the dots have numbers inside them. The objective is to connect horizontally and vertically adjacent dots so that the lines form a single loop with no loose ends. In addition, the number inside a square represents how many of its four sides are segments in the loop. LinkaPix (also known as "Paint by Pairs") consists of a grid, with numbers filling some squares; pairs of numbers must be located correctly and connected with a line filling a total of squares equal to that number. Squares containing '1' represent paths that are 1square long. Paths may follow any horizontal or vertical direction. Paths are not allowed to cross other paths. There is only one unique way to link all the squares in a properlyconstructed puzzle. When completed, the squares that have lines are filled; the contrast with the blank squares reveals the picture. FillaPix (also known as "Mosaik", "Japanese Mosaic", "Nurie Puzzle", "Nampre Puzzle") consists of a grid with number clues scattered in various places. Each number shows how many of the nine squares  the one with the number plus the eight around it  should be filled in. It is necessary to determine which squares are filled in and which should remain empty until the hidden picture is completely exposed. Battleships (also known as "Solitaire Battleships", "Battleship Solitaire") is a logic puzzle based on the Battleships guessing game. In a square grid of The numbers on the bottom and on the right of the grid show how many squares in the corresponding rows and columns are occupied by ships. Occasionally some squares may contain given ship or water segments as hints to help start the puzzle. The object is to discover where all ships are located. Hashiwokakero (from Japanese "Hashi o kakero"; literally "build bridges"; also known as "Hashi", "Bridges", "Chopsticks", or "AiKiAi") is a type of logic puzzle. It is played on a rectangular grid with no standard size, although the grid itself is not usually drawn. Some cells start out with (usually encircled) numbers from 1 to 8 inclusive; these are the islands. The rest of the cells are empty. The goal is to connect all of the islands into a single connected group by drawing a series of bridges between the islands. The bridges must follow certain criteria:
Masyu (also known as "Shiroshinju Kuroshinju", "White Pearls and Black Pearls") is a type of logic puzzle. It is played on a rectangular grid of squares, some of which contain circles; each circle is either "white" (empty) or "black" (filled). The goal is to draw a single continuous nonintersecting loop that properly passes through all circled cells. The loop must "enter" each cell it passes through from the center of one of its four sides and "exit" from a different side; all turns are therefore 90 degrees. The two varieties of circle have differing requirements for how the loop must pass through them:
Light Up (also known as "Akari", "Bijutsukan") is a logical puzzle. It is played on a rectangular grid of white and black cells. The player places light bulbs in white cells such that no two bulbs shine on each other, until the entire grid is lit up. A bulb sends rays of light horizontally and vertically, illuminating its entire row and column unless its light is blocked by a black cell. A black cell may have a number on it from 0 to 4, indicating how many bulbs must be placed adjacent to its four sides; for example, a cell with a 4 must have four bulbs around it, one on each side, and a cell with a 0 cannot have a bulb next to any of its sides. An unnumbered black cell may have any number of light bulbs adjacent to it, or none. Bulbs placed diagonally adjacent to a numbered cell do not contribute to the bulb count. Fillomino (also known as "Polyominous") is a type of logic puzzle. It is played on a rectangular grid of squares. Some cells of the grid start containing numbers, referred to as "givens". The goal is to divide the grid into blocks. The block must contain the number of cells indicated by the number in the cells of the block. The block cannot touch a similarly sized block, horizontally or vertically. Cells without numbers may form blocks necessary to complete the puzzle. Futoshiki (from Japanese, literally "not equal"; also known as "Hutoshiki", "Unequal") is a logic puzzle. The puzzle is played on a square grid, such as 9 x 9. The objective is to place the numbers 1 to 9 (or whatever the dimensions are) in each row, ensuring that each column also only contains the digits 1 to 9. Some digits may be given at the start. In addition, inequality constraints are also initially specifed between some of the squares, such that one must be higher or lower than its neighbour. These constraints must be honoured as the grid is filled out. Kuromasu (from Japanese "kuromasu wa doko da", literally "Where is Black Cells?"; also known as "Kurodoko") is played on a rectangular grid. Some of these cells have numbers in them. Each cell may be either black or white. The object is to determine what type each cell is. The following rules determine which cells are which:
Nurikabe is a logic puzzle ("nurikabe" in Japanese folklore is an invisible wall that blocks roads and upon which delays in foot travel are blamed; other names for the puzzle: "Cell Structure", "Islands in the Stream"). The puzzle is played on a grid, typically rectangular with no standard size. Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" according to the following rules:
Sashikabe combines Nurikabe puzzle with Sashigane puzzle. The goal is to blacken some cells of a grid according to the following rules:
Tents ("Tents and Trees") is a logic puzzle invented by Léon Balmaekers (Netherlands). The task is a grid of squares, some of them contain trees. The goal is to place tents in some of the remaining squares, in such a way that the following conditions are met:
KenKen (also known as "KENKEN", "KenDoku", "CalcuDoku", "Square Wisdom") is a mathematical and logical puzzle loosely similar to Sudoku. It was invented by a Japanese mathematics teacher Tetsuya Miyamoto. The objective is to fill the grid in with the digits 1 through N (where N is the number of rows or columns in the grid) such that:
Hidato (from Hebrew: "my puzzle"; also known as "Hidoku") is a puzzle invented by Gyora Benedek, an Israeli mathematician. The goal of Hidato is to fill the grid with consecutive numbers that connect horizontally, vertically, or diagonally. In every Hidato puzzle the smallest and the highest number are presented in the grid. There are more numbers on the board to help to direct the player how to start the solution and to ensure that Hidato has only a single solution. Numbrix is a type of logic puzzle. It is played on a rectangular grid of squares. Some of the cells have numbers in them. The object is to fill in the missing numbers, in sequential order, going horizontally and vertically only. Diagonal paths are not allowed. Shikaku (also known as "Divide by Squares", "Divide by Box", "Number Area") is a logic puzzle. It is played on a rectangular grid. Some of the cells in the grid are numbered. The objective is to divide the grid into rectangular and square pieces such that each piece contains exactly one number, and that number represents the area of the rectangle. Galaxies (also known as "Tentai Show", "SymaPix") consists of a rectangular grid with dots. The goal is to divide the rectangle into exactly one region per dot that is twofold rotationally symmetric around the dot. Skyscrapers consists of a square grid. The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. The numbers along the edge of the puzzle indicate the number of buildings which you would see from that direction if there was a series of skyscrapers with heights equal the entries in that row or column. Hakyuu (also known as "Ripple Effect", "Hakyuu Kouka", "Hakyukoka", "Seismic") is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into polyomino sections called "rooms". Each room must be filled with each of the numbers from 1 to the number of cells in the room. If two identical numbers appear in the same row or column, at least that many cells with other numbers must separate them. Grand Tour is a logic puzzle. It is a grid of points that all need to be connected by a single loop. To begin the puzzle, a few of the points are already connected to insure a unique solution. Easy as ABC ("ABC End View", "Last Man Standing") is a square grid, whose cells are to be filled by a range of letters (e.g. A through E), with each different letter occurring exactly once in each row and column, and the other cells remaining empty. The letters outside the grid show which letter will come across first from that direction. Clouds (also known as "Rain Clouds", "Radar") is a variant of Battleship puzzle. The task is to mark certain cells of the rectangular grid as belonging to a cloud. Clouds occupy an area of rectangular shape and their width and height is at least two cells. No clouds touch each other, not even diagonally. Numbers outside the grid show the quantity of cells occupied by clouds in corresponding row or column. Yajilin (also known as "Arrow Ring", "Straight and Arrow") is a type of logic puzzle published by Nikoli. The goal is to draw a single continuous nonintersecting loop that connects the centers of the grid cells. The loop may not pass through any cells which contain arrows. The loop may only travel horizontally or vertically, and never diagonally. Any cell that does not have an arrow and which is not part of the loop must be shaded in black. Black cells do not touch each other orthogonally (they do not share a side). A cell containing a number and an arrow represents how many black cells are in the row or column pointed at by the arrow. There may be black cells that are not accounted for by the cells with arrows and numbers. Minesweeper is wellknown by the game in Microsoft Windows. The task is to place mines into empty cells in the grid. The digits in the grid represent the number of mines in the neighbouring cells, including diagonal ones. Minesweeper Battleships (also known as "Battlemines") combines Battleships puzzle with Minesweeper game found on many computers. The aim is to locate the position of the fleet in the grid. The ships do not touch each other, not even diagonally. A cell with a number indicates how many ship pieces are adjacent to it. Ships are not allowed on the numbered cells. Heyawake (from Japanese, "divided rooms") is played on a rectangular grid. The grid is divided into rectangular "rooms". Some rooms may contain a single number. These rooms must have the designated number of cells painted black. Other rooms may have zero or more cells painted black.
Tenner Grid (also known as "From 1 to 10", "Zehnergitter", "Grid Ten") consists of a rectangular grid of width ten cells. The task is to fill in the grid so that every row contains the digits 0 through 9. In columns the numbers may be repeated. The bottom numbers give the sum of the numbers in column. The digits in contiguous cells (even diagonally contiguous cells) must be different. Hundred is a square grid of 3 x 3 or 4 x 4, whose cells are to be filled by some digits. The task is to fill additional digits in required cells such that the sum of numbers in each row and each column equals to 100. Arrows is a type of logic puzzle. It is played on a rectangular grid filled with numbers. The task is to place arrows outside the grid. Every arrow can go horizontally, vertically or diagonally and points to at least one cell with a number. The numbers indicate the total number of arrows that point to them. Mathrax consists of a square grid. The goal is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. Circles with additional conditions may be situated on intersections of lines inside the grid.
Str8ts (also known as "Straights") is a logic puzzle, invented by Jeff Widderich (Canada). It is a grid, partially divided by black cells into compartments. Each compartment, vertically or horizontally, must contain a straight  a set of consecutive numbers, but in any order (for example: 2134). The aim is to fill all white cells with the numbers from 1 to N (where N is the size of the grid). No single number can repeat in any row or column. Clues in black cells remove that number as an option in that row and column, and are not part of any straight. Linesweeper is played on a rectangular grid. The object is to create a single continuous nonintersecting loop that connects the centers of the grid cells. The numbered cells can't be passed through; the number in the cell means how many of the 8 surrounding cells should contain some part of the solution path. (For example, "0" means the 8 surrounding cells can't be passed through at all). Binairo (also known as "Binary Puzzle", "Takuzu", "Tohu wa Vohu") is played on a rectangular or square grid. The goal is to fill in the grid with digits "0" and "1" according to the following rules:
Walls is a logic puzzle, invented by Naoki Inaba (Japan). The task is to place a horizontal or a vertical line in every blank cell. A number in a black cell indicates the total length of the segments connected to that square. Dominosa (also known as "Dominosa Omnibus", "Solitaire Dominoes", "Domino Hunt") is a logic puzzle. On the board the domino numbers are shown, but the borders between dominoes are missing. The task is to restore borders between domino tiles. Patchwork (also known as "Tatami") consists of a square grid divided into regions ("rooms"). Each room must be filled with each of the digits from 1 to the number of cells in the room. Every row and every column must contain the same amount of each digit. Same digits must not be orthogonally adjacent. In some puzzles letters are used instead of digits. Cross+A can solve such puzzles also. Knossos is a logic puzzle ("Knossos" is a palace on Crete; this palace is connected with ancient legends, such as the myth of the Labyrinth with the Minotaur). It is played on a rectangular grid. Some of the cells in the grid are numbered. The goal is to divide the grid into regions (“rooms”) such that each region contains exactly one number, and that number represents the border’s length of the rectangle. Rekuto is played on a rectangular or square grid. Some of the cells have numbers in them. The aim is to divide the grid into rectangular and square pieces such that each piece contains exactly one number, and that number represents the sum of the width and height of the rectangle. Neighbours is played on a grid of irregular shape. Some cells of the grid contain numbers. It is necessary to divide the grid into a number of connected regions of an equal number of cells. Every region contains exactly one cell with a number (or a question mark) in it, and has as many neighbours as the number indicates. Regions are neighbours when they share a part of their border. Four Winds is played on a rectangular or square grid with black and white cells. All black cells contain numbers. The aim is to draw a horizontal or a vertical line in each white cell. Each number represents the total number of white cells occupied by the lines from that number. Lines cannot enter other numbered black cells or intersect with other lines. Shakashaka (also known as "Proof of Quilt") is a logic puzzle, invented by Nikoli. The task is to place one of the four isosceles right triangles in some white cells. Each triangle must occupy exactly half of its cell, but may be in one of four orientations. Every contiguous white region must be a rectangle or a square. A number in a black cell indicates how many triangles are adjacent to that cell by sides. Kakurasu is played on a rectangular or square grid. The goal is to color in some of the cells to satisfy the clues. The numbers across the top and down the left are the clues, and equal the row and column totals for the black squares. The numbers across the bottom and down the right are the values for each of the squares in the rows and columns (the first square in a row or column is worth 1, the second 2, the third 3, etc.). Mochikoro ("Mochinuri") is a logic puzzle. It consists of a grid, with numbers in some cells. The aim is to blacken some cells according to the following rules:
Seethrough (also known as "Doors", "Open Office") is a logic puzzle, where every cell denotes a "room". The aim is to close some "doors" between rooms. Open doors allow to look into other rooms. The number in the cell indicates the total number of rooms visible in horizontal and vertical direction from that room (the room itself excluded). There can be no isolated rooms; this means that you should be able to reach all rooms by moving horizontally and vertically. Lighthouses is played on a rectangular or square grid. It contains black cells with numbers ("lighthouses"). The number in the cell represents the number of ships lit by the lighthouse. A ship is lit if it is in the same row or column as the lighthouse, also ships behind other ships or lighthouses. Each ship is lit by at least one lighthouse. The ships are placed so that no ship touches any other ship or lighthouse, not even diagonally. Lighthouse Battleships combines Battleships with Lighthouses puzzle. A cell with a number is a lighthouse, and it indicates the total number of ship pieces that are in the same row or column as the lighthouse. Ships can not touch the lighthouses, not even diagonally. Tapa is a logic puzzle created by Serkan Yürekli (Turkey). The goal is to blacken some cells of the grid. All the black cells form one contiguous region. No 2 x 2 cell area within the grid can contain all black cells. Clue cells with numbers may not be filled in and tell the length of each consecutive black cell block in the eight surrounding cells. If there's more than one digit in a cell, the groups of black cells have to be separated by at least one white cell. Question marks can be used instead of clue numbers. Each question mark can represent any nonzero integer. Fobidoshi ("Forbidden Four") is a logic puzzle, invented by Naoki Inaba (Japan). It is played on a rectangular or square grid. Some of the cells have circles in them. The aim is to place circles into empty cells; all the circles must form an orthogonally continuous area. A line of connected circles must not contain more than 3 circles. Island (also known as "Tents Island", "Airando") is a logic puzzle invented by Naoki Inaba (Japan). It consists of a grid, with numbers in some cells. The aim is to blacken some cells of a grid according to the following rules:
Dominion is a logic puzzle created by Naoki Inaba (Japan). It consists of a grid, with letters in some cells. The aim is to blacken some cells of a grid according to the following rules:
Tren is a logic puzzle invented by Shinichi Aoki (Japan). The Japanese name of this puzzle means "parking" (each block is a car, and a grid is a car park). The puzzle contains a grid with numbers in some cells. The goal is to locate some blocks in the grid, having the size either 1 x 2 or 1 x 3. Each number in the grid should be part of a block, indicating the amount of the possible movements of the block. Blocks can only move in the direction of their short edge. No Four in a Row is played on a grid of irregular shape. Some cells of the grid contain 'X' and 'O'. The task is to fill in the grid so that four consecutive identical symbols never appear in any row, column or diagonal. Corral (also known as "Bag", "Cave") is a logic puzzle invented by Nikoli. The aim is to draw a single closed loop along the grid lines that does not intersect itself. The loop goes around all numbers. The numbers in the grid indicate how many cells inside the loop can be seen horizontally and vertically from that cell, including the cell itself. Question marks can be used instead of clue numbers. Each question mark can represent any nonzero integer. Foseruzu ("Four Cells") is a type of logic puzzle published by Nikoli. The goal is to divide the grid into regions of exactly four cells. The number inside a cell represents how many of its four sides are segments of region borders (including the border of the grid). Faibuseruzu ("Five Cells", "Solomon's Keep"): the grid needs to be divided into regions of exactly five cells. Sutoreto ("Sutoretokurosu", "Straight Cross") is a logic puzzle created by Naoki Inaba (Japan). It is played on a rectangular or square grid with black and white cells. Some white cells contain numbers. The aim is to place a number into every white cell. The numbers in a horizontal or vertical stripe of consecutive white cells must form a sequence of numbers without gaps, but in any order (for example: 2413). Renban consists of a square grid divided into regions. The aim is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row, column or region. All numbers in a region must form a sequence of consecutive numbers, but in any order (for example: 534). Buraitoraito ("Bright Light") is played on a rectangular or square grid. It contains black cells with numbers. The number in the cell represents how many stars can be seen from this cell. A star is visible from the black cell, if it is in the same row or column as this cell, but not behind other black cells. Irasuto ("Illustration") is a logic puzzle created by Naoki Inaba (Japan). A rectangular or square grid contains white and black cells with numbers. The goal is to blacken some cells of a grid according to the following rules:
Suguru ("Number Blocks") is a logic puzzle invented by Naoki Inaba (Japan). The task consists of a rectangular or square grid divided into regions. Each region must be filled with each of the digits from 1 to the number of cells in the region. Cells with the same digits must not be orthogonally or diagonally adjacent. Trinudo is a logic puzzle. It is played on a rectangular grid. Some cells of the grid start containing numbers, referred to as "givens". The goal is to divide the grid into blocks of either one, two or three cells. Blocks of the same size must not be orthogonally adjacent. Each given number represents the size of the block to which it belongs. Creek ("Kuriku") is played on a rectangular or square grid. Circles with digits from 0 to 4 may be situated on intersections of lines inside the grid. The digit in the circle indicates how many adjacent cells must be blackened. All the white cells must be connected horizontally or vertically. Gappy is played on a square grid. The aim is to blacken some cells of a grid according to the following rules:
Norinori ("Dominnocuous") is a logic puzzle invented by Nikoli. A rectangular or square grid is divided into regions. The aim is to blacken some cells of a grid according to the following rules:
Yonmasu ("Yonmasubunkatsu") is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains circles in some cells. The goal is to divide the grid into regions of exactly four cells. Each region contains one circle. Bricks consists of a square grid. The aim is to fill in each cell with numbers from 1 to N, where N is the size of the puzzle's side. No number may appear twice in any row or column. Every brick contains an odd number and an even number. Number Chain is a logic puzzle invented by Leonid Mochalov (Russia). A rectangular or square grid contains numbers from 1 to N in cells. The aim is to draw a single continuous line from the upper left corner to the lower right corner. The line includes each number from 1 to N exactly once. Kapetto ("Settokapetto", "Set Carpets") is a logic puzzle invented by Naoki Inaba (Japan). It is played on a rectangular or square grid. Some of the cells have numbers in them. The goal is to divide the grid into rectangular blocks such that each block contains exactly one number. The number represents the amount of cells in the block. The grid may contain cells that belong to no one block. Renkatsu is a logic puzzle created by Naoki Inaba (Japan). It is played on a rectangular or square grid filled with numbers. It is necessary to divide the grid into regions. Each region contains digits from 1 to the number of cells in the region. Eulero ("GraecoLatin Square", "Euler Square") is a puzzle with letters and digits. The goal is to fill in the grid with symbols according to the following rules:
Anraikumozaiku ("Unlike Mosaic") is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains circles in some cells. The goal is to divide the grid into rectangular regions. Each region contains one circle. Black cells do not belong to any region. Regions of the same size must not share an edge. Kurotto (from Japanese, literally "black units") is a logic puzzle published by Nikoli. The task consists of a grid, with circles in some cells; a circle may have a number inside or not. The task is to blacken some cells of a grid according to the following rules:
Tasukuea (from Japanese, literally "find squares") is a type of logic puzzles. It is played on a rectangular or square grid with numbers or question signs in some cells. The goal is to blacken some cells of a grid according to the following rules:
Star Battle consists of a square grid divided into regions. The goal is to place stars into some cells in the grid so that each row, column, and region contains the same number of stars. Stars cannot be placed in adjacent cells, not even diagonally. Araf (from Turkish, literally "purgatory"; original Japanese name  "Aidabeya") is a logic puzzle. It is played on a rectangular grid. Some of the cells in the grid are numbered. The goal is to divide the grid into regions such that each region contains exactly two numbers. Each region must have an area that is strictly between those numbers. For example, if the region contains 2 and 5, the region's area must be equal to 3 or 4. Kabingurodo ("Curving Road") is a logic puzzle invented by Naoki Inaba (Japan). It consists of a grid, with circles in some cells. The aim is to blacken some cells of a grid according to the following rules:
Thermometers is a kind of logic puzzles. The grid is filled with thermometers, which are either not filled, partly filled or completely filled. The numbers on the outside indicate how many squares are filled in that row or column. Every thermometer is filled from the base (circular part), towards the top. This does not depend on the actual orientation of the thermometer. Snake is a kind of logic puzzles. It is played on a rectangular or square grid, where two cells are marked. The task is to draw a single line ("snake") between marked cells; this line never touches itself, not even diagonally. Numbers outside the grid show how many cells must be blackened in the corresponding row or column. Peintoeria ("Paint Area") is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into regions. The goal is to blacken some cells of a grid according to the following rules:
Irupu ("ILoop") is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains circles in some cells. The goal is to locate some blocks in the grid, having the size either 1 x 3 or 3 x 1. Each block contains one circle and must be orthogonally adjacent to exactly two other blocks. All block cells form one contiguous region. Sashigane (from Japanese, literally "carpenter's square"; "Ellbound") is a type of logic puzzle published by Nikoli. The goal is to divide the grid into Lshaped regions. The two "legs" of a region must be exactly one cell wide. A circle represents a cell in which an "L" must bend (the grid contains circles not for all regions). A region must have the same number of cells as a number in a circle. An arrow marks the end of the region's "leg"; the arrow points to the cell in which the "L" bends. Chocona ("Chocolate") consists of a rectangular or square grid divided into regions. The aim is to blacken some cells of a grid according to the following rules:
Different Neighbours consists of a rectangular or square grid divided into regions. The aim is to place a number from 1 to 4 into each region so that no two regions that touch (even diagonally) share the same digit. LITS ("Nuruomino") is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into regions. The goal is to blacken exactly four connected cells in each region, to form an L, I, T, or S tetromino. The tetrominoes may be rotated or mirrored. When two tetrominoes in adjacent regions share an edge, they must not be of the same type. All tetrominoes must form an orthogonally contiguous area. The tetrominoes must not cover an area of 2 x 2 cells. Nanbaboru ("Number Ball") consists of a square grid. The goal is to fill in some cells with numbers from the given range. No number may appear twice in any row or column. A cell with a circle must contain a number; a cell with a cross cannot contain a number. Tairupeinto ("Tile Paint", "Crazy Pavement") consists of a rectangular or square grid divided into regions. The aim is to blacken some cells so that each region is either completely filled or completely empty. External numbers are the clues, and equal the row and column totals for the black squares. YinYang consists of a rectangular or square grid with white and black circles in some cells. The aim is to place a black or white circle in each empty cell so that all circles of same color are connected to each other, vertically or horizontally. Additionally, no 2 x 2 group of cells can contain circles of the same color. Nanro is a logic puzzle published by Nikoli. The task consists of a rectangular or square grid divided into regions. The goal is to fill in some cells with numbers. All numbers in a region must be the same. The given number in a region denotes how many cells in this region contain a number (all regions must have at least one number). When two numbers are orthogonally adjacent across a region boundary, the numbers must be different. Numbered cells must not cover an area of size 2 x 2 or larger. All cells with numbers must be interconnected. Light and Shadow is a type of logic puzzles. The aim is to divide the grid into gray and white regions. Every region contains exactly one number. The region must have the same number of cells as the number it contains. Numbers in white cells are part of white regions; numbers in gray cells are part of gray regions. Same colored regions cannot share an edge. Arukone ("Number Link") consists of a rectangular or square grid with numbers in some cells. The goal is to connect each pair of numbers with single continuous lines. The lines must neither cross nor touch each other. Tetroid is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains black cells. The aim is to divide the grid into regions of exactly four cells, to form an L, I, T, S or O tetromino. Black cells do not belong to any tetromino. The tetrominoes may be rotated or mirrored. When two tetrominoes in adjacent regions share an edge, they must not be of the same type. Sukima (from Japanese "Sukimaburokku"; literally "space between blocks") is a logic puzzle created by Naoki Inaba (Japan). A rectangular or square grid contains circles in some cells. The aim is to locate some regions in the grid, having the size of exactly three cells. Each region contains one circle. Each 2 x 2 area must contain at least one cell, that does not belong to any region. Black cells do not belong to any region. Triplets ("One or All") is a logic puzzle invented by Naoki Inaba (Japan). The task consists of a rectangular or square grid divided into regions of exactly three cells. Some cells contain figures of 3 kinds: squares, circles, triangles. The goal is to fill in each cell with figures. Each region must contain all identical or all different figures. When two figures are orthogonally adjacent across a region boundary, the figures must be different. Korekutokonekuto ("Correct Connection") is a logic puzzle created by Naoki Inaba (Japan). The task consists of white and black circles; some white circles may contain digits. The aim is to connect all white circles by horizontal and vertical lines. The lines must not cross other lines or black circles. The number of lines connected to the white circle must match the digit in that circle. Doppelblock consists of a square grid. The goal is to blacken two cells in each row and each column. The remaining white cells must be filled with the digits from 1 to N2, where N is the size of the puzzle's side. Each number appears once in every row and column. Numbers outside the grid show the sums of the numbers between two black cells in corresponding row or column. Furisuri ("Free Three") is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains circles in some cells. The goal is to locate some blocks in the grid, having the size of exactly three cells. Each block must contain one circle. It must be possible to move each block by one cell in at least one direction. Yagit (from Japanese "Yagi to ookami"; literally "goat and wolf") is a logic puzzle published by Nikoli. The task consists of a rectangular or square grid with circles ("goats") and squares ("wolves") in some cells. The task is to divide the grid into regions. Each region must contain either goats or wolves (but not both) and must not be empty. The border lines of the regions start and end on the edges of the grid. Lines can only turn at black dots. Lines can cross each other except at black dots. Not all black dots must be used by border lines. Purenrupu ("Pure Loop") is a logic puzzle created by Naoki Inaba (Japan). A rectangular or square grid contains black cells. The aim is to draw a single loop. The loop visits all white cells exactly once. The segments of the loop run horizontally and vertically between the centers of white cells. Firumatto ("Fillmat") is a logic puzzle published by Nikoli. A rectangular or square grid contains digits in some cells. It is necessary to divide the grid into rectangular regions. Every region must be exactly one cell wide; the other side of the region has length from 1 to 4 cells. A cell with a number indicates the size of a region. Two regions of the same size must not be orthogonally adjacent. A grid dot must not be shared by the corners of four regions. Nawabari ("Territory") is a logic puzzle published by Nikoli. The aim is to divide the grid into rectangular regions such that each region contains exactly one digit. The digit in the cell represents how many sides of the cell belong to the borders of the regions, including the edge of the grid. Makaro is a logic puzzle published by Nikoli. A rectangular or square grid is divided into regions. Each region must be filled with each of the digits from 1 to the number of cells in the region. The grid may contain the black cells with arrows. The arrow points at the biggest number among the four cells around (up, under, left, right) the black cell. When two numbers are orthogonally adjacent across a region boundary, the numbers must be different. DosunFuwari is a logic puzzle published by Nikoli. The task consists of a grid divided into regions. The grid may contain black cells; black cells do not belong to any region. The aim is to place one black circle and one white circle in each region according to the following rules:
Satogaeri (from Japanese; literally "coming home") is a logic puzzle invented by Nikoli. A rectangular or square grid is divided into regions. Some cells of the grid contains circles (empty or with numbers). The task is to move the circles vertically or horizontally, so each region contains only one circle. The numbers in the circles indicate how many cells they have to pass through. Circles without numbers may move any distance, but some of them stay put. The circles cannot cross the tracks of other circles and cannot move over other circles. Koburin is a logic puzzle published by Nikoli. A rectangular or square grid contains numbers in some cells. The aim is to blacken some cells and draw a single continuous nonintersecting loop that properly passes through all empty white cells. The number in the cell indicates the total number of black cells orthogonally adjacent to this cell. The grid may contain black cells not adjacent to cells with numbers. Cells with numbers must not be blacken. Two black cells must not be orthogonally adjacent. Sukrokuro combines the elements of three logic puzzles: Sudoku, Kropki Sudoku and Kakuro. It consists of a square grid with white and black cells. The goal is to fill in the white cells, one number in each, so that each column and row contains the numbers 1 through 9 exactly once. Black cells contain a diagonal slash from top left to bottom right with numbers in them, called "the clues". Such number tells the sum of numbers in consecutive cells at its right or downward. If absolute difference between two numbers in neighboring cells equals 1, then they are separated by a dot. If a dot is absent between two white cells, the difference between the numbers in these cells is more than 1. Shirokuro is a logic puzzle invented by Nikoli. It contains white and black circles. The task is to connect each white circle with a black circle by a horizontal or vertical line. Lines are not allowed to cross other lines. The line between two circles may not pass through other circles. Roma is a logic puzzle published by Nikoli. A rectangular or square grid is divided into regions. Some cells of the grid contain black circles. The goal is to place arrows pointing in four directions in each empty cell. Each region must contain all different arrows. Starting with any cell, following the arrows from cell to cell, this path must end in the cell with the black circle. Bodaburokku ("Border Block") is a logic puzzle published by Nikoli. A rectangular or square grid contains numbers in some cells. It is necessary to divide the grid into regions. Cells with the same number belong to the same region. All points where three or four lines meet are given. Every region contains at least one cell with a number. Kuroshuto ("Kurochute"; from Japanese, literally "black shot") is a logic puzzle invented by Nikoli. A rectangular or square grid contains numbers in some cells. The goal is to blacken some empty cells. A cell with a number indicates that only one of the cells with such distance must be blackened. Two black cells must not be orthogonally adjacent. All of the white cells must be connected. Toichika is a logic puzzle published by Nikoli. The task consists of a rectangular or square grid divided into regions. The goal is to place arrows in some cells according to the following rules:
Usotatami is a logic puzzle published by Nikoli. A rectangular or square grid contains numbers in some cells. The aim is to divide the grid into rectangular regions such that each region contains exactly one number. Every region must be exactly one cell wide; the length of the other side is NOT equal to the number in this region. A grid dot must not be shared by the corners of four regions. Pipelink consists of a rectangular or square grid. The task is to draw a single continuous loop that passes through all cells. The loop must use all given sections and may cross itself in any cell. Hakoiri is a logic puzzle published by Nikoli. A rectangular or square grid is divided into regions. The goal is to place exactly one triangle, one square and one circle in each region. The same figures cannot be placed in adjacent cells, not even diagonally. All the figures must be connected horizontally or vertically. Nuribou is a logic puzzle invented by Nikoli. A rectangular or square grid contains numbers in some cells. The task is to blacken some empty cells according to the rules:
Tatamibari is a logic puzzle invented by Nikoli. A rectangular or square grid contains 3 kinds of symbols: cross, horizontal bar, vertical bar. The goal is to divide the grid into rectangular regions. Each region contains one cell with a symbol. A region with a cross must be a square. If a region contains a horizontal bar, the region's width must be greater than its height. If a region contains a vertical bar, the region's width must be less than its height. A grid dot must not be shared by the corners of four regions. Sun and Moon ("Munraito") is a logic puzzle invented by Naoki Inaba (Japan). A square grid contains planets in some cells. The goal is to place exactly one star and one stardust cloud into each row and each column of the grid. If a particular semicircle of a planet is illuminated, there must be a star in that rank to light it. A star shines horizontally and vertically only; planets and stardust clouds block starlight. Kojun is a logic puzzle invented by Nikoli. A rectangular or square grid is divided into regions. Some cells contain numbers. Each region must be filled with each of the digits from 1 to the number of cells in the region. When two numbers are orthogonally adjacent, the numbers must be different. The upper number of two vertically adjacent numbers in the same region must be greater than the lower number. Usowan (from Japanese, literally "one liar") is a logic puzzle published by Nikoli. A grid is divided into rectangular and square regions. Some of the cells in the grid are numbered. The aim is to blacken some cells of a grid according to the following rules:
Gokigen Naname (from Japanese, literally "to be in a bad mood"; also known as "Slalom", "Slant") is a logic puzzle invented by Nikoli. It is played on a rectangular or square grid. Circles with digits from 0 to 4 may be situated on intersections of lines inside the grid. The aim is to fill in a diagonal line in every cell. The number in each circle equals the number of lines extending from that circle. The diagonal lines must not form a closed loop. HebiIchigo is a logic puzzle invented by Nikoli. The goal is to insert the numbers 1 to 5 according to the rules:
Hamle (from Turkish, literally "move") consists of a rectangular or square grid. The aim is to move every numbered black cell in one of the four directions, so that numbers in the cells indicate the length of their moves. When all moves are done, all white cells should be interconnected and numbered cells should not share an edge. Gyokuseki (from Japanese, literally "gems and stones") is a logic puzzle created by Naoki Inaba (Japan). The aim is to fill a square grid with black circles ("gems") and white circles ("stones"). Every row and every column contains one black circle and random quantity of white circles. A number at the edge of the puzzle indicates how many circles can be seen in the corresponding row or column up to and including the black circle. KinKonKan is a logic puzzle published by Nikoli. The task consists of a rectangular or square grid divided into regions. The goal is to fill in some cells with diagonal lines ("mirrors"). Each region contains exactly one mirror. Letternumber pairs at the edges of the grid can be connected by straight lines ("laser beams") that bounce of the same number of mirrors as the number in the letternumber pair. Every mirror must reflect at least one laser beam. Ichimaga is a logic puzzle invented by Nikoli. The task is to connect all circles by horizontal and vertical lines. The number of lines connected to the circle must match the digit in that circle. Any number of lines may be connected to the empty circle (at least one). The lines must not cross other lines. The line may change direction 90 degrees no more than once. Shimaguni is a logic puzzle published by Nikoli. A rectangular or square grid is divided into regions. The goal is to blacken some cells of a grid according to the following rules:
Meadows is a logic puzzle. It is played on a rectangular or square grid. Some of the cells have circles in them. The aim is to divide the grid into square blocks such that each block contains exactly one circle. YajisanKazusan (from Japanese, literally "arrow  number") is a logic puzzle published by Nikoli. The aim is to blacken some cells according to the following rules:
Snake Pit consists of a rectangular or square grid. The goal is to divide the grid into regions ("snakes") according to the following rules:
Hiroimono ("Goishi Hiroi"; from Japanese, literally "things picked up") is a logic puzzle invented by Nikoli. The grid contains circles ("stones") placed at some grid points. The task is to move along the grid lines and collect all the stones (number them in the order in which you pick them up) according to the following rules:
Water Fun is played on a rectangular or square grid. The goal is to fill water in some parts of the grid. Numbers outside the grid show how many cells of each row and column must be filled with water. Connected areas of filled cells must have the same level of water everywhere, like in a series of tubes. Word Puzzles Word Finder ("Word Search", "Word Seek", "Word Sleuth", "Mystery Word") consists of the grid with letters. The goal of this puzzle is to find and mark all the words hidden inside the grid. The letters in each word are orthogonally adjacent. Each letter can be used at one word only. The wordlist should be provided for the puzzle creating. Also the key word may be defined; this word will be formed from letters remaining in the grid. Nine Letters is the variation of Word Finder puzzle. It consists of the grid with letters. The grid is divided on 3 x 3 subgrids. The goal is to find and mark words hidden inside each subgrid. Spider Web consists of circles connected by lines. Each circle contains one letter. The aim is to find and mark a key word hidden inside the net of circles. Other Puzzles Maze is a puzzle consisting of a complicated network of paths or passages. The aim is to find a path between two selected points. Cross+A allows to create puzzles of rectangular, square or irregular shapes. 