Keep on shooting out ragdoll stickman guys until your cannon-man hits the red target. The closer the distance between the mouse and the cannon , the weaker the shoot is. If you want to make strong shuts, you should increase the distance between the mouse pointer and the cannon. You'd need strong hits for instance to move the rock away from the passage, so that you can throw in some stick guys and hopefully hit the red ball. Fun part of the game is that you have unlimited ammo, which means you can shoot as much as you like. Other than that the game is cool because of physics mechanics it utilizes so well. Sometimes glitchy though. Actually, very glitchy because the more stick you shoot out the glitchier the game gets, which is an obvious flaw. Still, worth a shot. Literally.