There are two challenge types. Type 1 are like mini-stages or boss battles and are accessed from the Challenge Menu. Type 2 are like Xbox's Achievements and don't need to be unlocked to do them. Type 1 boss and miniboss challenges generally require reaching the corresponding boss on the corresponding difficulty mode (the challenge is unlocked when you reach the boss, not when you kill it).
Unlockable How to Unlock Easy boss challenges Reach the boss on Easy Mode Easy miniboss challenges Reach the miniboss on Easy or Normal Mode Hard boss challenges Reach the boss on Hard Mode Hard miniboss challenges Reach the miniboss on Hard Mode Normal boss challenges Reach the boss on Normal Mode Normal minboss challenges Reach the miniboss on Normal Mode
Contributed By: NintendoDudeGuy.
Unlock Hard Mode
Beat the game or stage to unlock the specific weapon, item, or mode.
Unlockable How to Unlock Hard Mode Beat the game on Normal
Contributed By: GameMasterZer0.
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