Sudoku puzzles diagonals (Su Doku)My database includes 9516 puzzles for the moment and I'm constantly generating more.
Rules: Fill in the grid so that every row, every column, and every 2x4 box contains the digits 1 through 8. The diagonals must also contain 1 through 8. There is only 1 solution for each puzzle.
For more information check out Wikipedia.
146340 puzzles downloaded.