You have to fill in the missing numbers in the equations to stop Harvey being catapulted into the distance. Simply click on a number to select it.

There are four ropes holding the catapult down, so you've got four chances. You'll see the ropes snap if you choose a wrong number.

There are ten questions on each level. When you get 7 or more out of ten, you'll get the chance to move up a level.

However, the equations will get harder and harder as you move through the 4 levels, so be careful - or the rabbit gets it!