>_ Sudoku
Fill the grid so every row, column and 3×3 box holds 1–9 exactly once. Every puzzle is carved by a backtracking generator that guarantees one unique solution — the same solver powers the hints and the one-click solve.
← arcade
中文
1
2
3
4
5
6
7
8
9
✎ notes: off
⌫ erase
// difficulty
easy
medium
hard
expert
// run
time
00:00
best
—
// tools
↺ new puzzle
◇ hint
✓ check
⊞ solve
// how
Tap a cell, then a number (or press 1–9). 0/⌫ erases, arrows move.
Notes mode pencils small candidates. Picking a cell highlights its peers and matching digits; clashes glow red.