On Wharf when you have to jump crate to crate, you do not destroy the machine, you can fall off the platform then you must fall right. You shall land on a platform. There are 5 stars and 2 lives. On mad doctor level 2, when there's the tunnel, go on top of it, go against the wall, look up, jump, keep going right. You shall get to a platform and there are 2 stars and 1 live. You have to go back to the tunnel to finish the level.