Verified expert Sudoku
Play Expert Sudoku Online
Choose from three calibrated expert puzzles. New Game stays on Expert, and the verified difficulty facts update with the board.
Expert · LDI v0
Your current expert puzzle
LDI v0
Verified puzzle facts
- Puzzle ID
LDI0-04fa8d22cbe875aa1e8ebe8b51293ceb5be2fbd0- Difficulty model
- LDI v0
- LDI score (0–100)
- 67
- Clue count
- 26
- Logical steps
- 56
- Hardest technique
- XY-Wing
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 Expert Sudoku challenge
Play this tier in the dated challenge collection available through August 15, 2026.
Why this tier
Expert is the highest calibrated difficulty tier.
The score comes from proof-checked logical work in the same puzzle record shown with the board. Clue count alone does not set the tier.