This is a platformer game. You can use the arrow keys or WASD keys to move. You can use the mouse to aim and shoot an Rocket. On most screens, you will need to hit all of the targets with an arrow to be able to move on. Some levels might be hard, so if you get stuck then you can press the X key to automatically break all of the targets. You can press the Z key to turn on or off a guide, which will show you were the arrow will go. There are some platforms that you can jump up through. And you can press the down arrow to drop down through them.
