How to Solve Nonograms
A comprehensive guide to mastering the art of nonogram puzzles
What is a Nonogram?
A nonogram (also known as Picross, Griddlers, or Hanjie) is a logic puzzle where you reveal a hidden picture by filling in cells on a grid using numerical clues. These clues, displayed along the sides of the grid, indicate how many consecutive filled squares appear in each row and column.
Unlike Sudoku, which uses numbers:
- ✓ Nonograms create pictures through logical deduction
- ✓ No guessing is required in well-designed puzzles
- ✓ Every step can be solved through pure logic
- ✓ The solution reveals a meaningful image
Basic Rules
- 1 Numbers on the left indicate filled cells in each row
- 2 Numbers at the top indicate filled cells in each column
- 3 Numbers represent consecutive filled squares in order
- 4 Groups must have at least one empty cell between them
Example:
Step-by-Step Guide for Beginners
Start with the largest numbers
Look for rows or columns with large numbers that leave little room for variation.
Look for full rows/columns
If a number equals the grid size, that entire row/column must be filled.
Find overlaps
When a number is large enough, some cells must be filled regardless of the exact position.
Use crosses (X)
Mark cells that must be empty with X to help visualize the puzzle better.
Cross-reference
Compare information from rows and columns to confirm cell states.
Understanding the Logic
Nonograms are pure logic puzzles based on simple rules but capable of complex deductions. Success comes from understanding and applying these core principles:
Basic Techniques
- Determining where filled cells must be
- Identifying mandatory empty cells
- Using completed sections as anchors
Advanced Strategies
- Edge case analysis
- Pattern recognition
- Complex deduction chains
Frequently Asked Questions
Can a nonogram be unsolvable?
A properly designed nonogram should have exactly one solution and be solvable through logic alone. However, poorly designed puzzles might have multiple solutions or require guessing.
Do nonograms require guessing?
No, well-designed nonograms never require guessing. Every step should be deducible through logic. If you find yourself guessing, try looking for more logical steps you might have missed.
What makes a nonogram difficult?
Grid Size
Larger grids are generally more challenging
Cell Distribution
Complex patterns increase difficulty
Logic Complexity
Advanced deduction steps required
Solution Path
Number of steps to completion
Difficulty Levels
Beginner (5x5, 8x8)
Simple patterns, straightforward logic
Easy (10x10)
Basic techniques required
Medium (15x15)
More complex deductions needed
Hard (20x20)
Advanced techniques required
Expert (25x25 and larger)
Complex logic chains, requires significant experience
Tips for Success
Mark Empty Cells
Always mark cells you know must be empty with an X
Work Systematically
Start with larger numbers and work your way down
Use Markers
Right-click to mark uncertain cells
Double Check
Regularly verify your progress
Look for Patterns
Find rows or columns with partial information
Practice
Start with smaller grids before attempting larger ones