Instructions for Sudoku

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Fill in the blank squares so that each row, each column, and each 3-by-3 block contain all of the digits 1 thru 9.

Basic Interface

Type numbers to fill in cells.
Use the space bar, 0, or Backspace to clear cells.
Use arrow keys or tap to navigate to cells.

Shift-number is a shortcut to mark cells.
🅼 to toggle Mark-mode.

Drag or double-tap to select multiple cells for marking.
Mark-mode is automatic when multiple cells are selected.

Shift-arrow (or 🆂 arrow) for multiple cell selection.
Shift-tap also selects additional cells.