Difficulty and solvability is totally random as I randomly left a certain number of hints from a full-filled board.
In this demo, backtracking algorithm is used for generating the sudoku. Difficulty and solvability is totally random as I randomly left a certain number of hints from a full-filled board.
3 | 9 | 7 | ||||||
9 | 6 | |||||||
5 | 4 | 2 | 3 | 1 | 9 | 6 | ||
9 | 7 | 3 | 2 | |||||
7 | 6 | 9 | ||||||
1 | 8 | 9 | ||||||
6 | 8 | 1 | 3 | |||||
3 | 6 | 9 | 1 | |||||
2 | 1 | 5 | 3 |
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