How to play
The classic. Fill the 9×9 grid so every row, column and 3×3 box contains the numbers 1 through 9, each exactly once.
Rules
- Click an empty cell, then click a number below (or type it) to fill it in.
- Every row, every column, and every 3×3 box must contain each of 1–9 exactly once — a repeated number in that row, column or box is shown in red.
- Arrow keys move the selected cell; Backspace, Delete or 0 clears it.
- Fill in every cell correctly to solve the puzzle — pick a difficulty and press "New puzzle" any time for a fresh one.
Tips
Scan for numbers that are almost complete across the grid (eight of nine placed) — the last one is often forced into a single cell.
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