Mubunanba

Mubunanba ("Move Number") is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains digits in some cells. The goal is to locate some blocks in the grid, having the size of exactly three cells. The grid may contain cells that belong to no one block. Each block contains exactly one digit. A digit indicates the number of the possible directions to move a block.

Cross+A can solve puzzles from 3 x 3 to 30 x 30.

Mubunanba+:

• Each block contains exactly one digit or a question sign (an unknown digit), indicating the number of possible directions to move a block.
• All cells that are not part of any block must be connected horizontally or vertically.