Expert Nonogram
Expert Nonograms are 15×15 and need a contradiction: if filling, or leaving empty, a single cell would make a line impossible to match its clue, the cell must be the other way.
Expert puzzles need at least one of these techniques, and may use any easier one:
- Contradiction
- Assume the opposite in the marked cell and a rule breaks a few steps later. So it can only be this.
How to play
Nonogram is a picture logic puzzle, also known as Hanjie or Paint by Numbers. The numbers beside each row and above each column give the lengths of its runs of filled cells, in order, with at least one empty cell between runs. Fill the right cells and a picture appears.
Easy puzzles are 8×8, Medium 10×10, and Hard and Expert 15×15. Up to Hard, every row and column can be worked out on its own; Expert puzzles also need a short “what if” on a single cell. Every puzzle here has exactly one solution.
- Each number is a run of filled cells in that row or column, in the order shown.
- Runs in the same line are separated by at least one empty cell.
- A 0 means the line has no filled cells.
- Cells not covered by any run stay empty.
Playing on this site
- Choose Fill or Cross below the board, then tap a cell to mark it; tap it again to clear it.
- Drag to mark a stretch of cells; the drag locks to the row or column it starts along and is one undo step.
- With a keyboard, use the arrow keys to move, Space to mark, F and X to switch between Fill and Cross.
- A clue fades once its line matches the picture.
- Crosses are only a helper: the puzzle is solved as soon as the filled cells form the picture.
- Hint points out wrong cells first, then highlights a line whose clue decides the next cells.
- Your puzzle is saved in this browser, so you can come back to it later.