Challenge a Friend

Send this link to play the exact same board.

How to Play

• · Fill every row, column and 3×3 block with the digits 1–9.
• · Click a cell (or use arrow keys) then type 1–9 or use the numpad.
• · Backspace clears · N toggles pencil notes · Space pauses.
• · Terracotta digits are yours; dark digits are the givens.
• · Wrong entries shake and turn rose — but you can keep going.
• · Chromatic Flow warms the ink as the board fills.