Knock, Knock, Knock. Get the door open and go through it!Stagecleared! Every level provides a unique challenge with acreativecombination of objects: They may rotate, swing, wave,bounce, flyover or rock&roll. Watch carefully, plan ahead andgo for it.Make sure to knock on them for a certain number of timesto openthe door. No more, and no less! 160+ stages are ready foryou. Howmany of them can you go through? Try now!