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.