Use the mouse to draw. Change the color of the pen by pressing M until the pen color is what you want. E to erase (not the whole thing, just where you draw with the eraser). Space to test the platformer you've made. Avoid red. Blue is bouncy and will make you jump higher. Get to the yellow to win. YOU MUST HAVE YELLOW IN YOUR PLATFORMER TO PLAY OR ELSE IT WILL BE IMPOSSIBLE TO WIN (sorry for caps) You need to have black under blue or you will fall off the map.
Everything by me.