Display the Seed entry prompt at the "Character Select" menu. Note: In the PC version, press [Tab]. Enter one of the following seed codes to activate the corresponding cheat function. Entering a seed code will prevent achievements and trophies from being earned. Additionally some codes may delete your saved game file.

Effect	Code
All floors have the basement room tile set	BASE MENT
All items except troll bombs mimic Issac's movement	KEEP AWAY
Alternate Hard mode	HARD HARD
Analog television display	BOOB TOOB
Eligible enemies become champions	CHAMP1ON
Invisible enemies	BL1N DEYE
Isaac and tears turn black	PTCH BLCK
Isaac destroys rocks	NFB8 3WSG
Isaac is grey	KAPP A
Isaac leaves feces trail	BRWN SNKE
Isaac only visible as brown shadow	CAMO K1DD
Jumbled in-game text	DYSL EXIC
Load screen always displays "Are You Sure You Want Me To Die?"	1TEN DSHE
Reversed controls	DRAW KCAB
Slow motion while Isaac is idle	SLOW 4ME2
Sound effects replaced with farts	FART SNDS
Take damage when idle	D0NT ST0P