Finish the game once on any difficulty and you will unlock Arcade mode.
Unlockable How to Unlock Arcade mode Finish the game once on any difficulty
New Game +
Finish the game once and you will unlock (NG+), a harder difficulty with more enemies, and more upgrades for the health bar from the shop.
Unlockable How to Unlock New Game + Finish the game once on any diffeculty
The true ending
After you finish the game you begin another loop of the game but with harder difficulty (NG+), and there will be a true final boss and the true ending.
Unlockable How to Unlock The true ending Finish the game in ( new game + )
Know Something We Don't?
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Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.