Left and right keys for the paddles. Power ups: 1-Up Mushroom (The green ones, for those who haven't played Mario): Gives one extra ball. Super Mushroom (The red ones): Grows your ball temporarily. Clock: Speeds up your ball. Invincibility Candy: Makes you invincible.
Just to say, the invincibility is a bit glitchy. I'm not sure why. Click the icon to choose what ball you use.