Verified medium Sudoku
Play Medium Sudoku Online
Choose from three calibrated medium puzzles. New Game stays on Medium, and the verified puzzle facts update with the board.
Medium · LDI v0
Your current medium puzzle
LDI v0
Verified puzzle facts
- Puzzle ID
LDI0-020a16dfa63d6d2cf42de1e946495f4d99bc3955- Difficulty model
- LDI v0
- LDI score (0–100)
- 15
- Clue count
- 26
- Logical steps
- 55
- Hardest technique
- Hidden Single
Clue count is a board fact, not the difficulty verdict. The tier comes from this published LDI version.
Sudoku difficulty pages
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Latest available daily challenge
Latest available Medium Sudoku challenge
Play this tier in the dated challenge collection available through August 15, 2026.
Why this tier
Medium puzzles require more logical work than the Easy tier.
The LDI score combines the proof-checked techniques and logical steps required by the puzzle shown on the board.