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Completion bonuses:
Successfully complete the game under the easy difficulty setting to unlock the "Unbreakable Melee Weapons" and "Bullet Reflection" options. Successfully complete the game under the normal difficulty setting to unlock the "Vampiric Health" and "All Weapons" options. Successfully complete the game under The One difficulty setting to unlock the "Infinite Health" option.
Bonuses:
Collect the hidden briefcases to unlock various bonuses. Note: Some briefcases are given as rewards for completing hidden objectives.
The One mode:
Successfully complete the first level (Lobby Dreams) without dying to unlock The One difficulty setting, which is the hardest difficulty setting.
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