At the title screen, press: Up 4 times, Right 2 times, Down 8 times, Left. Start the game and you'll be able to select from levels 11 and up.
Contributed By: ReyVGM.
Hidden level and ending
If you can play all the way to the last level without continuing you will get to play a Secret stage, and they are 3 of the hardest levels in the game. If you manage to beat them you will get a different ending.
Contributed By: Ices100.
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