Medium · LDI v0
Play Medium Sudoku Online
Choose from three calibrated medium puzzles. New Game stays on Medium, and the verified puzzle facts update with the board.
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.
What Medium feels like
The same core logic now takes more patient, repeated scanning.
The current Medium catalogue still resolves with singles, but its verified LDI scores are higher than Easy. Fewer placements appear on the first pass, so each result must trigger a careful rescan of its row, column, and box.
How to approach Medium
Use short candidate lists to reveal less obvious singles.
After each placement, update only the affected row, column, and box, then look for a number that can occupy just one square in that unit. Notes preserve the comparison, so you can resume the scan without rebuilding every candidate.
Daily Sudoku challenges
Medium Daily Sudoku challenges
Choose any available date, then select this difficulty to play a free, verified puzzle.
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.