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Archive · Mini Sudoku #20

Mini Sudoku #20 (October 16, 2026): solution and step-by-step

The hard 6×6 from Friday, October 16, 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 #20 was the hard 6×6 of Friday, October 16, 2026, with 10 clues given and 26 cells to fill. Our technique solver, the one behind the hint button, fills it in 26 steps using 5 hidden singles and 21 naked 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 39 on our scale (easy below 25, medium below 34, hard below 45, expert above).

Mini Sudoku #20 in numbers

DifficultyHard (score 39)
Clues given10 of 36
Solver steps26
Naked singles21
Hidden singles5
Pairs, pointing and claiming0
X-wings0
Hint walk: digits placed / pencil-mark steps26 / 0
How to start Mini Sudoku #20: 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. 3 goes in row 2, column 6. 3 has just one place left in row 2: every other empty cell there already sees a 3.

  2. 3 goes in row 1, column 3. 3 has just one place left in row 1: every other empty cell there already sees a 3.

  3. 6 goes in row 3, column 1. 6 has just one place left in row 3: every other empty cell there already sees a 6.

  4. 5 goes in row 6, column 1. Row 6, column 1 can only be 5: every other number already sits in its row, column or box.

  5. 2 goes in row 2, column 1. Row 2, column 1 can only be 2: every other number already sits in its row, column or box.

  6. 1 goes in row 1, column 1. Row 1, column 1 can only be 1: every other number already sits in its row, column or box.

  7. 4 goes in row 6, column 3. Row 6, column 3 can only be 4: every other number already sits in its row, column or box.

  8. 6 goes in row 6, column 2. Row 6, column 2 can only be 6: every other number already sits in its row, column or box.

  9. 2 goes in row 5, column 2. Row 5, column 2 can only be 2: every other number already sits in its row, column or box.

  10. 1 goes in row 6, column 4. Row 6, column 4 can only be 1: every other number already sits in its row, column or box.

  11. 3 goes in row 6, column 5. Row 6, column 5 can only be 3: every other number already sits in its row, column or box.

  12. 2 goes in row 1, column 5. 2 has just one place left in row 1: every other empty cell there already sees a 2.

14 more moves finish the grid.

Mini Sudoku #20 solution

Given clues in grey, filled digits in black.

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

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