1. Fill the grid so that every row, column, and 3x3 box contains the numbers 1 through 9.
2. Click on a cell and enter a number from 1 to 9.
3. Pre-filled numbers cannot be changed.
4. Click "Check" to see if your solution is correct.
5. Click "Reset" to clear all entries you made.
6. Click "New Puzzle" to start a fresh game.