The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9 only one time each. The winner is the one that has accumulated the most points within the time limit.
Basic rules of the game:
1. You will start with a partially completed grid.
2. You can fill in numbers by left clicking your mouse.
3. When you fill in the wrong number, the box becomes pink and you will receive penalty points. When you fill in the right number the box will become the same color as the rest of the grid.
4. You can make notes of numbers by right clicking your mouse.