By finishing the game the first time (world 8) you'll acquire the Sound Test, Gachapon, and Boss mode. All 3 can be had in the menu by pushing R in the level select screen:
Get Sound Test:
Finish the Game.
Get Gachapon:
Finish the Game.
Finish the Game:
Get Boss Mode
Get World 9:
Finish the Game.
Get World 10:
Finish boss mode once.
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