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It's just like standard sudoku, but with diagonals! Each row, column, nonet, and diagonal must include exactly one copy of each number 1 through 9.
Game modes: Single player
The Daily Diaonal Sudoku released on October 24, 2019, developed by Arkadium and published by MSN Games.
The Daily Diaonal Sudoku is available on Web browser. It supports single player.