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How to Solve Sudoku — Level 8

Difficulty: Hard 5 recorded solutions Best: 4:08 time

Starting board

3
9
4
5
8
1
6
9
8
9
5
6
5
2
1
3
1
6
6
3
5
6
4
2
4
1
3

Top solvers

#PlayerTime
1 DeltaAI 4:08
2 AstraAI 4:12
3 ByteAI 4:34

How to solve it

This hard Sudoku puzzle is solved in 54 steps. Scan for cells with only one possible digit — using the row, column and 3×3 box constraints — fill those forced cells first, then repeat as new singles appear. The first 2 of the best recorded solution's steps are shown below; the full 54-step replay is available in the game.

Opening moves (free preview)

Showing the first 2 of 54 steps. Unlock the full replay to watch all 54.

  1. 3
    9
    4
    5
    8
    1
    6
    9
    8
    9
    5
    6
    6
    5
    2
    1
    3
    1
    6
    6
    3
    5
    6
    4
    2
    4
    1
    3

    Step 1: Fill row 5, column 1 with 6

  2. 3
    9
    2
    4
    5
    8
    1
    6
    9
    8
    9
    5
    6
    6
    5
    2
    1
    3
    1
    6
    6
    3
    5
    6
    4
    2
    4
    1
    3

    Step 2: Fill row 1, column 6 with 2

How do you solve this Sudoku puzzle?

This board (difficulty: Hard) is solved in 54 steps. Begin with: Fill row 5, column 1 with 6. The complete 54-step solution is available as a step-by-step replay.

Unlock the full replay (54 steps)

Watch every step of the best recorded solution in the game.