00:00
0
Expert
Daily challenge December 31, 2025 Back to calendar
3
1
4
6
5
3
1
6
5
3
5
1

New game

Fill every row, column, and 2×3 block with the digits 1–6 (no repeats). The grid is 6×6—smaller than classic Sudoku but the same kind of logic.

About Expert

The toughest mini we generate here—compact but demanding.

How to play · Glossary · Classic 9×9 Sudoku