In Challenge Mode, some challenges are marked ???? by default to access them, you must meet the following conditions in Story Mode
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Unlockable |
How to Unlock |
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Blade E |
Reach Blade Man in Easy Mode |
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Blade H |
Reach Blade Man in Hard Mode |
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Blade N |
Reach Blade Man in Normal Mode |
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Block Devil E |
Reach Block Devil in Easy Mode |
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Block Devil H |
Reach Block Devil in Hard Mode |
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Block Devil N |
Reach Block Devil in Normal Mode |
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Chill E |
Reach Chill Man in Easy Mode |
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Chill H |
Reach Chill Man in Hard Mode |
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Chill N |
Reach Chill Man in Normal Mode |
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Commando E |
Reach Commando Man in Easy Mode |
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Commando H |
Reach Commando Man in Hard Mode |
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Commando N |
Reach Commando Man in Normal Mode |
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Crab Puncher E |
Reach Crab Puncher in Easy Mode |
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Crab Puncher H |
Reach Crab Puncher in Hard Mode |
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Crab Puncher N |
Reach Crab Puncher in Normal Mode |
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Nitro E |
Reach Nitro Man in Easy Mode |
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Nitro H |
Reach Nitro Man in Hard Mode |
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Nitro N |
Reach Nitro Man in Normal Mode |
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Octobulb H |
Reach Octobulb (Sheep Man stage) in Hard Mode |
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Pump E |
Reach Pump Man in Easy Mode |
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Pump H |
Reach Pump Man in Hard Mode |
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Pump N |
Reach Pump Man in Normal Mode |
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Sheep E |
Reach Sheep Man in Easy Mode |
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Sheep H |
Reach Sheep Man in Hard Mode |
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Sheep N |
Reach Sheep Man in Normal Mode |
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Solar E |
Reach Solar Man in Easy Mode |
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Solar H |
Reach Solar Man in Hard Mode |
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Solar N |
Reach Solar Man in Normal Mode |
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Strike E |
Reach Strike Man in Easy Mode |
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Strike H |
Reach Strike Man in Hard Mode |
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Strike N |
Reach Strike Man in Normal Mode |
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Suzak and Fenix H |
Reach Suzak and Fenix (Solar Man Stage) in Hard Mode |
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The Keeper H |
Reach The Keeper Man (Strike Man Stage) in Hard Mode |
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TriCastle H |
Reach TriCastle (Blade Man Stage) in Hard Mode |
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W Archive E |
Reach the first Wily Archive in Easy Mode |
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W Archive H |
Reach the first Wily Archive in Hard Mode |
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W Archive N |
Reach the first Wily Archive in Normal Mode |
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Wily Capsule E |
Reach Wily Capsule in Easy Mode |
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Wily Capsule H |
Reach Wily Capsule in Hard Mode |
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Wily Capsule N |
Reach Wily Capsule in Normal Mode |
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Wily Machine E |
Reach Wily Machine in Easy Mode |
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Wily Machine H |
Reach Wily Machine in Hard Mode |
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Wily Machine N |
Reach Wily Machine in Normal Mode |
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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).
Beat the game or stage to unlock the specific weapon, item, or mode.