21 – 22 Clues Given
Free Master / Evil Sudoku — Extreme Logical Puzzles
The ultimate Sudoku test with minimal clues (21-22). Pure logical deduction with unique solutions.
Medium Sudoku Puzzle
Mistakes: 0
00:00
Master Sudoku
Swordfish
Forcing Chains
Alternating Inference Chains (AIC)
Rules:
- Keep your pencil notes completely up-to-date after every move.
- Use the step-by-step smart hint if you encounter an elusive deadlock.