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Archive · Mini Sudoku #21

Mini Sudoku #21 (October 17, 2026): solution and step-by-step

The hard 6×6 from Saturday, October 17, 2026. Play it first; the moves and the solved grid are folded below. Replays don't affect your streak.

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Mini Sudoku #21 was the hard 6×6 of Saturday, October 17, 2026, with 11 clues given and 25 cells to fill. Our technique solver, the one behind the hint button, fills it in 25 steps using 19 naked singles and 6 hidden singles; no pencil-mark technique is needed, so every cell can be placed by scanning rows, columns and boxes. That profile gives it a difficulty score of 40 on our scale (easy below 25, medium below 34, hard below 45, expert above).

Mini Sudoku #21 in numbers

DifficultyHard (score 40)
Clues given11 of 36
Solver steps25
Naked singles19
Hidden singles6
Pairs, pointing and claiming0
X-wings0
Hint walk: digits placed / pencil-mark steps25 / 0
How to start Mini Sudoku #21: the first 12 moves

Each move is what the hint button would say at that point, from the empty grid. Rows and columns are counted from the top-left corner.

  1. 4 goes in row 2, column 4. Row 2, column 4 can only be 4: every other number already sits in its row, column or box.

  2. 1 goes in row 2, column 3. Row 2, column 3 can only be 1: every other number already sits in its row, column or box.

  3. 4 goes in row 1, column 2. Row 1, column 2 can only be 4: every other number already sits in its row, column or box.

  4. 5 goes in row 2, column 2. Row 2, column 2 can only be 5: every other number already sits in its row, column or box.

  5. 3 goes in row 2, column 5. Row 2, column 5 can only be 3: every other number already sits in its row, column or box.

  6. 6 goes in row 6, column 4. Row 6, column 4 can only be 6: every other number already sits in its row, column or box.

  7. 5 goes in row 3, column 5. 5 has just one place left in row 3: every other empty cell there already sees a 5.

  8. 3 goes in row 4, column 1. 3 has just one place left in row 4: every other empty cell there already sees a 3.

  9. 3 goes in row 5, column 6. 3 has just one place left in row 5: every other empty cell there already sees a 3.

  10. 5 goes in row 5, column 1. 5 has just one place left in row 5: every other empty cell there already sees a 5.

  11. 2 goes in row 6, column 3. 2 has just one place left in row 6: every other empty cell there already sees a 2.

  12. 2 goes in row 3, column 2. 2 has just one place left in row 3: every other empty cell there already sees a 2.

13 more moves finish the grid.

Mini Sudoku #21 solution

Given clues in grey, filled digits in black.

Row by row: 2 4 3 5 6 1 · 6 5 1 4 3 2 · 1 2 4 3 5 6 · 3 6 5 1 2 4 · 5 1 6 2 4 3 · 4 3 2 6 1 5.

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