Practice mental math skills. Quick reflexes!
Combine all of the Number Blocks to that the last block is equal to zero. A tricky puzzle game because depending on how you combine the blocks the numbers in them are either added together or subtracted from each other. More instructions via clicking the Instructions button on the main menu. If you get stuck you can see how to complete each level by clicking the Video button on the main menu.
Combine blocks by swiping a block either vertically or horizontally using a mouse or your finger on touch devices.