PlaySudoku.us
Easy · Puzzle #579
3
8
6
9
4
9
1
2
5
3
6
5
4
8
3
9
2
9
3
8
4
7
6
3
7
2
5
4
8
4
5
7
1
9
9
7
3
6
4
8
3
6
1
7
7
6
1
4
9
8
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but larger grids become exponentially harder.
Solving Sudoku is NP-complete for an n×n grid. For the standard 9×9, it's fast — but larger grids become exponentially harder.
Practice solving puzzles at a difficulty level where you succeed 90% of the time. That's the zone of maximum skill growth.
Practice solving puzzles at a difficulty level where you succeed 90% of the time. That's the zone of maximum skill growth.