Suirodoku Daily Challenge #5

July 13, 2026 · one worldwide grid (UTC) · medium · digits × colors

3
6
2
1
5
7
3
2
5
7
3
4
9
3
8
4
5
6
3
2
7
7
1
3
9
4
5
6
4
6
1
7
2
3
5
3
8
4
7

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Suirodoku is a free online color sudoku: every row, column and region holds the digits 1-9 AND all 9 colors, and each digit-color pair appears exactly once. The math behind it · Daily hub