Nonogram (Picross) is a logic puzzle. Numbers on each row and column show consecutive blocks of filled cells. Solve the picture by filling the right cells.

• Left-click / tap — toggle empty ↔ fill. Clears a mark first.
• Right-click / long-press — toggle empty ↔ X mark (known empty).
• Marks are notes only; they do not count toward the solution.
• You win when every filled cell matches the solution (extras fail).
• Easy includes Hint: reveals one correct unfilled cell.
• Desktop & mobile supported. Long-press ≥400ms to mark on touch.