1. The number tiles fall in from above. Place them from the bottom up so that no number 1 through 9 is placed more than once in and row, column or 3x3 box. You are only allowed to make three mistakes. Wild tiles have no value and can be placed anywhere without breaking the Sudoku rules.
2. You control the game with your keyboard. Move the falling tiles sideway with the Left and Right arrow, and make them fall faster with the Down arrow. Use the Space bar to make a tile fall all the way down instantly.
3. You get bonus point for making a full row, column or 3x3 box. You also get a bonus for making a vertical or horizontal triple, which is using the same number in three 3x3 boxes, so that it is never represented by a wild tile. This also converts the 3 tiles into wild tiles, which makes your life easier later in the game. The Golden tiles raise the scores of any combination you make.