If you type in one of these codes as a seed, you can play a special run with unique features. Unlike normal seeds, the floor layout will be different each time. However, achievements & unlocks will be temporarily disabled.
Effect | Password
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All enemies are friendly towards you. (Flies spawned by Duke of Flies die instantly, but Dingle's dingleberries do not) | CLSTRPHO
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Applies a filter that makes the game look like it's being played through a cathode ray tube. | B00BT00B
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Basement repeats infinitely. | BASEMENT
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Character leaves a trail of poop behind him as he walks. | BRWNSNKE
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Enemies are dazed. | C0NFETT1
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Enemies are invisible (including bosses, fires, etc). | BL1NDEYE
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Enemies respawn once player leaves cleared room (includes bosses). New items won't drop. | COMEBACK
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Get hit by one enemy that does damage and you die. Similar to playing as The Lost. | BRTLB0NS
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Isaac wears a Santa hat. | CHRSTMAS
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Makes a lot more blood appear after death of the enemies. | BLOOOODY
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Makes all enemies charmed permanently. | COCKFGHT
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Music is slowed | ANDANTE
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Music is sped up. | ALLEGR0
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Turns all enemies into their champion versions (if they have one). | CHAMP10N
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Turns character invisible. | CAMOK1DD
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Turns enemies invisible. | CAM0F0ES
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Turns pick-ups invisible. | CAMODROP
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