You play as a robot that jumps between floating cubes with numbers on them. When you land on a cube, it is crushed and its number decreases. When a cube's number reaches zero, it falls and disappears. Your job is to get rid of all the cubes to complete the level and unlock the next one.
But! Be careful with the order in which you take down the cubes. If you break the wrong cube, there may be no way for you to get to the remaining cubes.