Forever Crossing - Extra Mode
Beat World 12 to unlock Extra Mode for the Forever Crossing mini game, a much faster and more difficult mode.
Forever Crossing Extra Mode - Beat World 12
After you beat the game. World 7 will now be available. World 7 is a faster and much harder version of World 1. Beating World 7 will unlock 8 and consecutively up to World 12 which are all harder versions of worlds 1 through 6.
Hard Mode - Beat the Game
Unlock Challenge Mode
Complete every stage making sure to not skip over any when the path branches off and beat the game. The question marks on the main menu will now say Challenge.
Challenge Mode - Beat the game while completing every stage