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When you have unlocked the Leech Hunter mini game collect the indicated amount of leeches to unlock the corresponding bonus for the main game.
Unlock Machine Gun Ammo for the main game:
Collect 1-29 Leeches
Unlock Unlimited Ammo for ALL Handguns found in the main game:
Collect 30-59 Leeches
Unlock Unlimited Ammo for the Hunting Rifle in the main game:
Collect 60-89 Leeches
Unlock Magnum Revolver for the main game:
Collect 99-90 Leeches
Unlock Unlimited Ammo for ALL weapons found in the main game:
Collect 100 Leeches
Finish the game in under a certain time on Normal or Hard difficulty setting to get a specific ranking and gain the corresponding bonus.
Unlock Closet Key and Leech Hunter Minigame:
Get Ranking B (Finish in 5:01 - 7:00).
Unlock Closet Key and Leech Hunter Minigame:
Get Ranking C (Finish in 7:01 - 9:00).
Unlock Closet Key and Leech Hunter Minigame:
Get Ranking D (Finish in 9:01 and more).
Unlock Machine Gun, Closet Key and Leech Hunter Minigame:
Get Ranking A (Finish in 3:31 - 5:00).
Unlock Rocket Launcher, Machine Gun, Closet Key and Leech Hunter Minigame:
Get Ranking S (Finish in 3:30 and below).