Mental arithmetic is as easy as standing on your head drinking a glass of water, eating an entire pizza in less than a minute, or listening to a whole 1 Direction album. How do I know? Because I tried each and every last one of them (Results: Water spilt on floor, only 2 slices of pizza managed, up to halfway through track 5).
Thanks to Nozoku Rush, mental arithmetic is also more fun than all these things, which is honestly not something I thought I would ever say. Just get rid of the numbers that are falling down into the grid,the result should always be 0. See how you get on, as Nozoku Rush drops from $1.99 to FREE.