Shade Out
Shade cells so no number repeats in any row or column — shaded cells never touch, and the rest stay connected.
Interactive lesson1 / 4
Rule 01
Shade cells to remove duplicates.
Each row and column must have no repeated number among the unshaded cells. Shade the cells that cause duplicates.
All rules
Rule 01Shade cells to remove duplicates.
Each row and column must have no repeated number among the unshaded cells. Shade the cells that cause duplicates.
Rule 02Shaded cells never touch.
No two shaded cells may be orthogonally adjacent (side by side).
Rule 03Unshaded cells stay connected.
All unshaded cells must form one connected group through orthogonal adjacency.
Rule 04Stuck? A hint shades or circles one cell.
The hint places a mark the solver derives from the current board. In ranked play, each hint adds 15 s.
Tap a cell to cycle its mark: empty → shaded → circled → empty · keyboard: arrows move, Space or Enter cycles
Got it — play