Sudoku

Fill the 9×9 grid so every row, column, and 3×3 box contains the digits 1–9 exactly once. Select a cell and type a digit or use the number pad. Toggle notes mode to pencil in candidates.

Keyboard: arrows move · 1–9 enter · Backspace erase · N notes · U/Ctrl+Z undo · R/Ctrl+Y redo · H hint · P pause