What Is a Nonogram?
A Nonogram, also known as Picross or Griddlers, is a picture logic puzzle solved with number clues around a grid.
Each clue tells you how many consecutive black cells appear in that row or column. Separate clue numbers mean separate groups with at least one empty cell between them.
The challenge is to decide which cells must be filled and which cells must be excluded. Marking X spaces is essential because it helps narrow the puzzle without guessing.
How to Play Nonogram
Nonogram rules are simple, but solving well depends on careful elimination.
- 1Read the row and column clues around the grid.
- 2Fill cells that must be black according to the clue numbers.
- 3Mark cells with X when you know they must stay empty.
- 4Use completed rows and columns to reduce the remaining choices.
- 5Avoid guessing when the clues can still prove a move.
- 6Complete every row and column clue to solve the puzzle.
Why Play 15x15 Nonogram Hard?
- •15x15 gives this Nonogram puzzle its own rhythm and clue density.
- •Hard changes how compact and demanding the picture logic feels.
- •Play instantly in your browser with no download, no signup, and mobile-friendly controls.
Nonogram FAQ
What is different about 15x15 Nonogram Hard?
15x15 Nonogram Hard changes the grid size and clue pressure, so the puzzle feels different from other Picross modes.
Is Nonogram the same as Picross?
Yes. Picross is a popular name for Nonogram-style picture logic puzzles. You may also see them called Griddlers, Hanjie, or Paint by Numbers.
Why do I need to mark X cells?
X marks help you record cells that must stay empty. Good Nonogram solving depends on both filling confirmed cells and excluding impossible cells.
How do I know a row is complete?
A row is complete when its filled groups match the clue numbers exactly. This game highlights completed rows and columns automatically.
What size should beginners choose?
5x5 is the fastest way to learn. 10x10 is a balanced default, while 15x15 gives a deeper Picross challenge.
Can I play Nonogram without downloading anything?
Yes. You can play Nonogram directly in your browser with no download and no signup.