Sudoku strategies at a glance
Mutant Swordfish
Finned Mutant Swordfish
X-Cycle
3D-Medusa
Unique Rectangle
Unique Rectangle Type 1:
Hidden Unique Rectangle
Firework
Sue De Coq Extended
SK Loop
Exocet
Alternate Inference Chain
Digit Forcing Chains
Nishio Forcing Chains
Cell Forcing Chains
Unit Forcing Chains
Always "ON":
Always "OFF":
Some candidates "ON" in a Cell:
Some candidates "ON" in a region: