Little Killer Sudoku contains numbers and arrows around the edge. The numbered arrows outside the grid indicate the sum of the digits in the corresponding direction. Digits can repeat in the direction of the arrow.
Little Unique Killer Sudoku is a variation of Little Killer Sudoku. Clues outside the grid indicate the sums of digits in the direction of the corresponding arrow. Digits may not repeat within a sum.
Task files have the extension *.LKSD.