PlaySudoku.us
Expert · Puzzle #691
6
8
4
6
7
9
3
5
4
5
6
4
8
3
2
1
9
3
7
3
1
9
1
3
In 2013, researchers proved computationally that every valid 16-clue Sudoku puzzle has a non-unique solution — 17 is truly the minimum.
In 2013, researchers proved computationally that every valid 16-clue Sudoku puzzle has a non-unique solution — 17 is truly the minimum.
Research shows that solving logic puzzles improves spatial reasoning — the same cognitive skill used by architects and engineers.
Research shows that solving logic puzzles improves spatial reasoning — the same cognitive skill used by architects and engineers.