Nonogram

Nonogram — also called Picross, Griddlers, or Hanjie — is a logic puzzle invented in Japan in the 1980s where number clues along every row and column tell you exactly which cells to fill, revealing a hidden pixel-art picture when solved correctly. Play nonogram online free in your browser with grid sizes from 5x5 for beginners all the way to challenging 20x20 puzzles. Pure deductive logic: no guessing required.

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How to Play

Each number clue on a row or column represents a consecutive run of filled cells, with at least one empty cell between separate numbers. Left-click to fill a cell, right-click (or use X Mode) to mark a cell as definitely empty. Work through rows and columns alternately until the hidden image is fully revealed.

Tips & Strategies

• •Overlap technique: if a line is 10 cells wide and has a clue of 7, the middle 4 cells (positions 4 through 7) must be filled regardless of where the run starts — shade them immediately.
• •Mark cells you know are empty with an X right away; empty-cell certainty is just as valuable as fill certainty and prevents costly errors later.
• •When a row's clues sum to the full line width (accounting for mandatory gaps), every cell is determined — solve these fully-constrained lines first.
• •Alternate between rows and columns constantly — a single new filled cell in one direction often resolves multiple cells in the crossing direction.
• •Enable Error Detect mode so the game flags incorrect cells immediately; catching one wrong fill early prevents it from invalidating dozens of subsequent deductions.

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