The beta featured a level selection mode (let's call it "debug mode") that allowed players to choose levels. When you beat the first Bowser, he dropped a star instead of a key; furthermore, upon exiting the pit where Bowser was located, the screen would go black for a simple reason: there was actually *no* level inside that pit (it functioned only in debug mode, so we can consider it the finish line). Also, the Bowser level lacked platforms and started immediately with the boss fight, and Bowser could be killed with just a single bomb.