In Deluxe mode, collect $2.00 to have a mothership Boss appear. To defeat it, wait until it shoots skulls out, then throw the skulls back to the ship while it is still open. To make this easier, destroy all the enemies before the Boss appears. Normal items will stop appearing during the Boss fight, making it difficult to remain alive if you are still being chased by enemies. Defeating the Boss will reward you with a rare "Dave" block, which will not only kill all enemies but also raise the destroyed platforms back into place.