the challenge in this game does not lie in the enemies or the levels, what's challenging is figuring out the controls. you are a robot that moves by hopping on a foot mounted to you by a spring, so you have to jump to move. hold down the up arrow key and the l/r key that corresponds to the direction you desire to move in. if you are holding down l/r but you arn't holding down the up arrow key then you will attack. you can attack guards to kill them and attack boxes to move them. you can hold down the spacebar to charge up for a higher jump. there is a charge meter that shows how much you have charged at the top. there is also a blue health meter. this game will probably take a little while to get the hang of so dont quit!