Sudoku techniques
The techniques this site's puzzles actually use. Every one of them is shown on a real board.
146 techniques
Starter
5 techniquesSingle
Easy
16 techniquesComplex Single
Locked Candidates
Subset
Medium
50 techniquesFish
Single Digit Pattern
Wing
Irregular Wing
Almost Locked Candidates
Avoidable Rectangle
Unique Loop
Unique Rectangle
- Unique Rectangle 2B/1
- Unique Rectangle 2D/1
- Unique Rectangle Type 1
- Unique Rectangle Type 4
- Hidden Unique Rectangle
- Unique Rectangle 3N/2
- Unique Rectangle 3U/2
- Unique Rectangle 3X/2
- Unique Rectangle 4C/3
- Unique Rectangle Burred Subset
- Unique Rectangle Type 2
- Unique Rectangle Type 6
- Unique Rectangle Type 3
- Unique Rectangle 4X/1L
- Unique Rectangle 4X/1U
- Unique Rectangle 4X/2L
- Unique Rectangle 2D
- Unique Rectangle 3X
Empty Rectangle
Borescoper Deadly Pattern
BUG
Hard
63 techniquesIrregular Wing
Avoidable Rectangle
Unique Rectangle
XYZ-Ring
Sue de Coq
Complex Fish
Extended Subset Principle
Broken Wing
AIC and chains
- Purple Cow
- X-Chain
- Alternating Inference Chain (AIC)
- Continuous Nice Loop
- Discontinuous Nice Loop
- XY-Chain
- XY-X-Chain
- Grouped Purple Cow
- Finned Grouped Chain
- Grouped Alternating Inference Chain (Grouped AIC)
- Grouped Continuous Nice Loop
- Grouped Discontinuous Nice Loop
- Node Collision
- Grouped Self-Constraint
- Grouped XY-Chain