Requirements

Welcome to the SudokuNew wiki!

1. User can select difficulty level (Easy (4x4), Medium (6x6), Hard(9, 9)).
2. User can view the rules of Sudoku.
3. User can input a number into a blank square.
4. User can attempt and fail to replace a puzzle number.
5. User can press "Check" button to verify their solution.
6. User can re-enter numbers and check again until they have the correct solution.