The Chromatic Circle is an advanced color sudoku strategy that helps you find missing numbers by tracking one color across the entire grid. If you already know the Rainbow technique, this is its complement.
The Principle
The Principle
Each color must contain all numbers from 1 to 9.
If you find a color with 8 different numbers, you know which number is missing. Then find where that number goes in an empty cell of that color.
The color reveals the number. This is the opposite of Rainbow Technique where the number reveals the color.
Step-by-Step Example
Step-by-Step Example
Track the Green cells. They contain numbers 1-8 — 9 is missing!
Result: By tracking the Green color across all numbers, we found that 9 was missing and placed it!
Key Points
Key Points
Rainbow vs Chromatic Circle
| Technique | Track | Find |
|---|---|---|
| Rainbow | A number across colors | Missing color |
| Chromatic Circle | A color across numbers | Missing number |
When to Use It
When to Use It
- Mid-to-late game: When many cells are filled
- Complementary: Use with Rainbow for maximum effect
- Expert puzzles: Essential for difficult levels
Pro tip: Scan all 9 colors regularly. One of them might have 8 numbers visible!
Practice Now
Practice Now
Combine Chromatic Circle with Rainbow to become unstoppable. Practice on Easy puzzles first.