Use WASD to move and jump. Use your mouse to aim your paint gun, then click to fire. There are two types of ammo: Spitter and Boomer. Use Spitter to launch yourself through the air, and to find cracks in the walls. When you find a crack, press Space to switch to Boomer, and then click to blow up the wall.

Refill ammo by jumping into the color pools. Find all the gold treasures in each level, then walk to the exit door and press E to leave. But the best treasure hunters will stick around to find the two extra-secret red gems in every level!