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.
7 | 8 | 2 | 5 | 4 | ||||
9 | 5 | 3 | ||||||
4 | 2 | 7 | 5 | |||||
5 | 7 | 6 | 1 | 4 | ||||
6 | 7 | 5 | ||||||
1 | 4 | |||||||
9 | 1 | 3 | 4 | |||||
2 | 7 | 6 | 8 | 1 | ||||
6 | 3 | 9 |
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