I can't take credit for the idea behind this game but I can take credit for coding it :) This is an educational game which refines simple mental addition skills. 10 stacks of numbers are gradually filling up, that is new numbers are being added on top. When any one stack reaches the top of the screen it's game over. Your job is to prevent this by popping off numbers off the top of the stacks. You have to select numbers which sum to exactly 10. For example; if you select 5, 3, and 2 from 3 different stacks then those numbers will be popped off the stacks. You can only select the topmost item in a stack but it can remain selected even as new numbers have been stacked on top of them. If you end up with a sum greater than 10 then all selected numbers will be deselected. The game starts out slow and gradually increases as you progress.