When the game starts, you will have a 10x10 grid of numbers, and a Goal number to the right. The object of the game is to select numbers that add up to the goal. For instance, to add up to 17, you may click on a 5, 8 and 4. When you reach the goal, a number goal is generated. The game ends when a goal is generated that can not be reached with the numbers left on the grid. Your score is based on how fast you are able to reach the goals, and how many numbers you used to get to the goal -- the more numbers the better. When the game is over, you lose 500 points for every number left on the grid.