Collect all the keys and reach the exit in each level. Be careful though, you can't land on any platforms that are the same color as you and every time you touch a platform you repaint it with your current color.
Collect the required amount of crystals to complete each level. Use your ability to copy and paste items, as well as the ability to activate and deactivate blocks, to overcome obstacles and solve puzzles.
Collect all the stars in each level by hitting them with a ball of the same color. Use designated cannons to shoot the ball around, change its size and color, and overcome a variety of different obstacles.
Reach the exit goal in each level by using your ability to swap the properties of any two objects. Give spikes a flat surface, turn metal blocks springy like a trampoline, and do anything else you can think of to overcome a variety of obstacles.