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Instructions for Sudoku

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.

Advanced Interface

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.

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