What Other Puzzles Are Like Sudoku?
Investigate the core facts What Other Puzzles Are Like Sudoku with our in-depth report.
A puzzle consists of filling in a nine-by-nine grid, such that each row, column, and three-by-three subgrid contains only one of an integer value. In other words, you are not allowed to enter another one in the first row, first column, or first subgrid of the “Hard 1” puzzle on the bottom left.