Nonogram Strategy — How to Solve Puzzles
Whether you're tackling your first 5×5 grid or a complex 20×20 challenge, these techniques will help you solve nonogram puzzles faster and more confidently. The key principle: never guess. Every cell you fill or cross should be logically certain.
Beginner Nonogram Tips
1. Start with the Biggest Numbers
Look for rows and columns with large clue numbers relative to the grid size. In a 10-cell row, a clue of "7" means the block of 7 must overlap significantly no matter where it's placed — several cells in the middle are guaranteed to be filled. This is the overlap technique and it's the most powerful beginner strategy.
2. Complete Lines First
If a row's clue numbers add up to exactly the row length (accounting for mandatory gaps), the entire line is determined. For example, "3 3" in a 7-cell row can only be: ■■■_■■■. Fill the whole line immediately.
3. Mark Empty Cells (X)
Don't skip the X marks. Marking cells as definitely empty is just as important as filling cells. It constrains future deductions and prevents errors. If a clue is "0", cross the entire line right away.
Intermediate Strategies
The Overlap Technique in Detail
For any clue number, push the block as far left as possible, then as far right as possible. Any cells that are filled in both positions are guaranteed to be filled. Example: clue "6" in a 10-cell row — leftmost position fills cells 1-6, rightmost fills cells 5-10. Cells 5 and 6 are filled in both cases, so they're certain.
Edge Solving
If you know the first cell in a row is filled and the first clue is "3", you can fill the next two cells as well (the block must start at the edge). Similarly, if the first cell is crossed, the first block can't start there — use this to narrow positions.
Space Counting
If the empty space between two determined blocks is too small to fit any remaining clue, cross those cells. This is especially useful in later stages of solving when many cells are already determined.
How to Win Nonogram Puzzles
Cross-Reference Rows and Columns
Every cell belongs to both a row and a column. When you fill or cross a cell based on row logic, immediately check what that means for the column — and vice versa. This cascading deduction is how complex puzzles unravel.
When to Use Hints
If you're stuck for more than a minute on the same grid, use a hint. It's better to learn from a revealed cell than to guess and potentially ruin your progress. You get 3 hints per puzzle — save them for genuine deadlocks.
Use the Check Feature
If something feels wrong, use Check to highlight errors before they cascade. One wrong cell early can make the entire puzzle unsolvable, and it's much easier to fix a single error than to start over.
Picross Strategy for Advanced Players
On larger grids (15×15 and 20×20) with "hard" difficulty, you'll encounter puzzles that require deeper logic: considering multiple possible arrangements for a clue set and finding cells that must be filled (or empty) in every valid arrangement. This is essentially what the overlap technique does, but applied to entire clue sets rather than single numbers. Work methodically through each line, combining information from both axes, and the solution will emerge.