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Daily Sudoku for October 21, 2026

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The daily sudoku for October 21, 2026 is a Hard puzzle with 26 clues and an SE rating of 3.5. It is the same grid the Suuudokuuu app serves as its daily challenge that day, everywhere in the world: the board is forged from the UTC date alone, so the app, this page and the archive all arrive at it independently.

The Hard daily sudoku for October 21, 2026.
c1c2c3c4c5c6c7c8c9
r19254
r285231
r35
r4687
r5824
r6
r7937
r8561
r91536
Open today’s daily challenge in the app
Difficulty
Hard
SE rating
3.5
Solution steps
57

Techniques this puzzle needs

Solved the way the SE rating measures it, reaching for the cheapest technique that still makes progress, this puzzle needs Full House, Naked Single, Hidden Single, Hidden Pair and Sashimi X-Wing. The hardest of them sets its rating; the sudoku difficulty rating guide explains the scale.

Step-by-step solution

Every placement and elimination below is proved by a named technique, in the order the engine found them. Each technique links to its guide. Stuck on a different puzzle? The step-by-step solver narrates any grid you paste.

Show all 57 steps
  1. The Hidden Single places 3 in r1c1. Hidden Single
  2. The Hidden Single places 1 in r1c4. Hidden Single
  3. The Hidden Single places 7 in r1c7. Hidden Single
  4. The Hidden Single places 6 in r1c9. Hidden Single
  5. The Full House places 8 in r1c8. Full House
  6. The Hidden Single places 6 in r2c2. Hidden Single
  7. The Hidden Single places 4 in r2c7. Hidden Single
  8. The Hidden Single places 8 in r7c2. Hidden Single
  9. The Hidden Single places 6 in r3c6. Hidden Single
  10. The Hidden Single places 3 in r3c5. Hidden Single
  11. The Hidden Single places 8 in r3c4. Hidden Single
  12. The Hidden Single places 4 in r9c4. Hidden Single
  13. The Hidden Single places 6 in r7c3. Hidden Single
  14. The Hidden Single places 4 in r7c8. Hidden Single
  15. The Hidden Single places 5 in r7c7. Hidden Single
  16. The Hidden Single places 2 in r7c5. Hidden Single
  17. The Full House places 1 in r7c6. Full House
  18. The Hidden Single places 1 in r6c5. Hidden Single
  19. The Hidden Single places 3 in r8c3. Hidden Single
  20. The Hidden Single places 4 in r8c1. Hidden Single
  21. The Hidden Single places 2 in r9c1. Hidden Single
  22. The Full House places 7 in r9c3. Full House
  23. The Hidden Pair removes 5, 7, 9 from r5c1, r5c1, r5c7. Hidden Pair
  24. The Hidden Single places 5 in r5c8. Hidden Single
  25. The Sashimi X-Wing removes 9 from r8c6. Sashimi X-Wing
  26. The Naked Single places 7 in r8c6. Naked Single
  27. The Hidden Single places 7 in r5c2. Hidden Single
  28. The Hidden Single places 7 in r3c1. Hidden Single
  29. The Hidden Single places 1 in r3c3. Hidden Single
  30. The Full House places 4 in r3c2. Full House
  31. The Hidden Single places 7 in r2c5. Hidden Single
  32. The Full House places 9 in r2c4. Full House
  33. The Hidden Single places 7 in r6c4. Hidden Single
  34. The Full House places 5 in r4c4. Full House
  35. The Hidden Single places 5 in r6c1. Hidden Single
  36. The Hidden Single places 6 in r5c1. Hidden Single
  37. The Full House places 1 in r4c1. Full House
  38. The Hidden Single places 6 in r6c7. Hidden Single
  39. The Hidden Single places 8 in r6c9. Hidden Single
  40. The Hidden Single places 4 in r6c3. Hidden Single
  41. The Full House places 9 in r4c3. Full House
  42. The Hidden Single places 4 in r4c9. Hidden Single
  43. The Hidden Single places 3 in r4c2. Hidden Single
  44. The Full House places 2 in r6c2. Full House
  45. The Full House places 2 in r4c7. Full House
  46. The Hidden Single places 2 in r3c8. Hidden Single
  47. The Full House places 9 in r3c7. Full House
  48. The Full House places 9 in r6c8. Full House
  49. The Full House places 3 in r6c6. Full House
  50. The Full House places 9 in r5c6. Full House
  51. The Hidden Single places 2 in r8c9. Hidden Single
  52. The Hidden Single places 9 in r8c5. Hidden Single
  53. The Full House places 8 in r9c5. Full House
  54. The Full House places 8 in r8c7. Full House
  55. The Full House places 1 in r5c7. Full House
  56. The Full House places 3 in r5c9. Full House
  57. The Full House places 9 in r9c9. Full House
Show the completed grid
The completed grid for October 21, 2026.
c1c2c3c4c5c6c7c8c9
r1392154786
r2865972431
r3741836925
r4139568274
r5678249153
r6524713698
r7986321547
r8453697812
r9217485369

More daily puzzles

Every day since the archive began has its own page. Browse the Daily sudoku archive, October 2026, or go back to today’s daily sudoku.