Three kinds of board
DIGIGMA has four live games. They share one idea: a unique solution, no need to guess. The boards feel different.
**Sudoku** is a 9×9 of digits. Each row, column, and box holds 1 through 9. You hunt for the only cell a digit can take, or the only digit a cell can take. How to play Sudoku.
**Killer Sudoku** is the same 9×9, plus dashed cages. The cages are the clues. There are no given digits. Each cage must add up to its printed total, and a digit cannot repeat inside a cage. How to play Killer Sudoku.
**Star Battle** is placement. On the live boards, 6×6 and 8×8, you place one star in every row, column, and region. Stars cannot touch, even at a corner. Dots mark empty cells. How to play Star Battle.
**Binary Puzzle** is 0s and 1s on 6×6 and 8×8. Each line has equally many of each, no three identical in a line, and every line is different from the others. How to play Binary Puzzle.
If one board goes stale, open another. The how-tos are short.