Use the arrow keys or WASD to move the Purbalds and make them jump. Collect the stars and get all of the Purbalds into the door safely. The number of Purbalds that need to make it to the door is shown above the door. If you can't get some of your Purbalds to the door, don't worry! Just make sure that the number above the door is 0 and then hold spacebar to "pop" all of your remaining Purbalds!