SudoKurious
Sample Boards
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How to Play
Standard
Fill the grid so every row, column, and 3x3 box contains digits 1-9.
X-Sudoku
Same as standard, but the two main diagonals must also contain digits 1-9.
Killer Sudoku
Digits in cages must sum to the total shown in the top-left corner. No repeats in a cage.