Difficulty.<<<

Easy mode.<< Have most of the enemies' attacks really weak.

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Medium mode. << Nothing...

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Hard mode.<< Have most of the enemies' attacks really strong.

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Legendary mode.<< Will have enemies' have strong and fast attacks. (And it will unlock the JoyBoyJack boss)

Challenges.<<<

Pacify challenge.<< Try not to hurt any enemies there is.

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Hurtless challenge.<< Try not to get hurt.

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Timer challenge.<< Try not to run out of time or Lucky / Unlucky will chase you down. (If she cheches your dead instantly)

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Speedrun challenge.<< Complete the game as fast as possible. (All cutscenes, and results will be skipped)