Place a number from 1-9 in each empty cell so that each row, each column and each 3 x 3 block contains all the numbers from 1-9. You have been given some "starter" numbers to help you, and they are shown underlined. Simply click a blank cell to insert your number. If you make a mistake, simply click the number to insert a new one.
Statistics are gathered on your performance at this game, and the performance of others, too. The Top Ten players are shown. Every time you insert a number, you gain 10 points. But beware! Every time you change a number, you lose 15 points. If you reset the grid, you start the game again with minus 200 points.