Verified daily Sudoku challenge
Daily Sudoku for July 21, 2026
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Available through: August 15, 2026
Four verified puzzles
Easy
| | 5 | | | 2 | | | | |
| 2 | | | 3 | | | 8 | | |
| 6 | | 9 | | | 7 | | | |
| 1 | | | | 7 | | | | |
| 8 | 7 | | | 5 | | | 9 | 4 |
| | | | | 3 | | | | 2 |
| | | | 6 | | | 7 | | 5 |
| | | 4 | | | 8 | | | 3 |
| | | | | 9 | | | 4 | |
- Puzzle ID
LDI0-0690f663e9c361279190f6111571b37290d54aba- Clue count
- 25
- Unique solution
- Verified
- LDI v0 score
- 13
- Tier
- Easy
- Hardest technique
- Hidden Single
- Logical steps
- 56
Verified key step: Naked Single: place 1 at row 3, column 9.
Medium
| | 3 | | | | | 9 | 2 | |
| | | | 2 | | | 1 | | 6 |
| | | | 4 | | | 3 | | 7 |
| | 9 | 2 | | 5 | | | | 1 |
| | | | | | | | | |
| 1 | | | | 4 | | 6 | 5 | |
| 8 | | 9 | | | 2 | | | |
| 4 | | 3 | | | 8 | | | |
| | 2 | 5 | | | | | 1 | |
- Puzzle ID
LDI0-16cf8afcb5154ae069c94d830b0970daa541ff9a- Clue count
- 26
- Unique solution
- Verified
- LDI v0 score
- 21
- Tier
- Medium
- Hardest technique
- Hidden Single
- Logical steps
- 55
Verified key step: Naked Single: place 8 at row 3, column 8.
Hard
| 3 | 8 | | 6 | | | 2 | | 5 |
| | 2 | | | 8 | | 4 | | |
| 7 | | | | | | | | |
| | | | | 1 | | | | |
| | | 4 | 3 | 7 | | | 5 | |
| | | | 8 | | | | 2 | 3 |
| | | | 1 | 6 | | | | 8 |
| | 9 | | 5 | | | | 1 | |
| | | | | | 2 | | | |
- Puzzle ID
LDI0-10888265d2fe770d6059ffa92ceb46d8b21555cd- Clue count
- 24
- Unique solution
- Verified
- LDI v0 score
- 22
- Tier
- Hard
- Hardest technique
- Hidden Single
- Logical steps
- 57
Verified key step: Hidden Single: place 2 at row 5, column 1.
Expert
| | | | | 6 | 1 | | | |
| 3 | 8 | 5 | | 2 | 9 | | | |
| 7 | | | 8 | | | | | |
| | | | 1 | | | | | 3 |
| | | | | | 4 | | 6 | |
| | | 4 | | 5 | | 2 | | |
| | | | 6 | | | 4 | | |
| | 1 | 9 | | | | 7 | | |
| | | 7 | | | | 9 | 5 | |
- Puzzle ID
LDI0-16379a7facf73a335a1743900df1da9b64470bb9- Clue count
- 24
- Unique solution
- Verified
- LDI v0 score
- 58
- Tier
- Expert
- Hardest technique
- Locked Candidates
- Logical steps
- 64
Verified key step: Naked Single: place 2 at row 1, column 3.
2026-07-21 · LDI v0
Play this dated challenge
LDI v0
Verified puzzle facts
- Puzzle ID
LDI0-0690f663e9c361279190f6111571b37290d54aba- LDI score (0–100)
- 13
- Clue count
- 25
- Logical steps
- 56
- Hardest technique
- Hidden Single
Clue count is a board fact, not the difficulty verdict. The tier comes from this published LDI version.