Last updated: March 2026
What Is a Picross Puzzle?
Picross — also known as nonogram, griddler, or paint-by-numbers — is a logic puzzle where you fill in cells on a grid to reveal a hidden picture. Number clues along each row and column tell you how many consecutive cells to fill.
Unlike Sudoku, which uses numbers, Picross creates a visual reward when you solve it. Each completed puzzle reveals a pixel-art image, making the solving process both challenging and satisfying.
This free online version offers multiple grid sizes, from quick 5×5 puzzles to challenging 20×20 grids. No download, no account, no ads — just pure puzzle-solving fun.
Key Features
Multiple difficulty levels. Start with small 5×5 grids to learn the basics, then progress to 10×10, 15×15, and 20×20 puzzles for a real challenge.
Click and mark. Left-click to fill a cell, right-click (or long-press on mobile) to mark it as empty. Clear visual feedback helps you track your progress.
Error checking. Optional error highlighting helps beginners learn the rules without getting stuck on impossible configurations.
Touch-friendly. The interface works great on phones and tablets with responsive grid sizing and intuitive touch controls.
Frequently Asked Questions
What is a Picross puzzle?
Picross (also called nonogram or griddler) is a logic puzzle where you fill in cells on a grid based on number clues along the rows and columns. When solved correctly, the filled cells reveal a hidden picture.
How do I solve a Picross puzzle?
Look at the number clues for each row and column. Each number tells you how many consecutive cells to fill in that line. Use logic to determine which cells must be filled and which must be empty. Start with the largest numbers and rows/columns with the most constraints.
Are Picross puzzles good for the brain?
Yes. Picross puzzles exercise logical reasoning, pattern recognition, and spatial thinking. They're a great way to keep your mind sharp while having fun, similar to Sudoku or crossword puzzles.
What grid sizes are available?
The tool offers multiple grid sizes from small 5x5 puzzles for beginners to larger 15x15 and 20x20 grids for experienced players. Start small to learn the mechanics, then work your way up.