A fresh, uniquely-solvable puzzle every time — generated right here in your browser. Click a cell, punch in a number, jot pencil notes, and race the clock. No sign-up, no ads, nothing leaves your device.
Click or tap a cell, then choose a number below or type 1–9 on your keyboard (0/Backspace to erase). Toggle Notes (or press N) to jot pencil marks. Arrow keys move around the grid. Conflicting numbers turn orange.