Expert · LDI v0
Play Expert Sudoku Online
Choose from three calibrated expert puzzles. New Game stays on Expert, and the verified difficulty facts update with the board.
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.
What Expert feels like
A deliberate solve built around the catalogue’s highest logical workload.
Expert puzzles offer fewer short deductions and demand a disciplined candidate map. Progress can depend on recognising a pattern only after several earlier eliminations remain consistent.
How to approach Expert
Slow down, preserve the proof trail, and separate candidates from conclusions.
Update notes systematically, verify every elimination in its row, column, and box, and use Hint as a teaching step when the next logical placement is unclear. Avoid guessing: the published solution is proof-checked.
Daily Sudoku challenges
Expert Daily Sudoku challenges
Choose any available date, then select this difficulty to play a free, verified puzzle.
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.