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Seeds, essentially random strings of characters, are used as the basis for all decision making in the game. By inputting a seed manually, you can guarantee that most randomly-generated decisions will occur the same every time. For instance, two players using the same seed will find the same items in the same locations.

Notes

  • With the exception of some special seeds, inputting a seed will cause the 'no trophies' mark Disables achievements to appear. This prevents any achievements from being obtained on that particular run.
  • Special seeds do not affect level generation.
  • All alphanumeric characters are accepted except for 5, I, 0, and U. On the PC version pressing the I, O, and U keys during seed entry will replace them with 1, 0, and V respectively.
  • DLC.png Once a special seed has been entered, it will be permanently unlocked without needing to enter the code again. Pressing Q / Left Bumper during character selection will bring up the Easter Egg Section, in which any previously unlocked game mode can be selected. Selecting multiple modes at once is also possible.

Special Seeds

Seed Description Effects
Miscellaneous
BASE
MENT
Infinite basements Disables achievements The Basement repeats infinitely.
KEEP
AWAY
Tricky pickups Disables achievements Pickups mimic Isaac's movements.
DLC.png
G0NE
S00N
Pickups time out Pickups quickly fade.
FREE
2PAY
F2P version Disables achievements Isaac starts with 69 coins, but all items and consumables must be bought.
PAC1
F1SM
Pacifism Disables achievements Enemies do not take damage. All doors stay open. When in a boss room, the boss's health slowly drains.
C0ME
BACK
Enemies respawn Disables achievements Enemies, including bosses, respawn once Isaac leaves the room. Completing a room multiple times does not yield additional pickups.
DLC.png
N0RE
TVRN
Point of no return Boss rooms lock Isaac in similar to the Mom fight.
BRWN
SNKE
Poopy trail Disables achievements Isaac leaves a trail of poop behind him as he walks.
DLC.png
ALM1
GHTY
Dog mode Disables achievements Isaac is invincible.
K1DS
M0DE
Kids' co-op mode Disables achievements Makes co-op babies invincible.
Curses
DLC.png
DARK
NESS
Permanent darkness Permanent Curse of Darkness.
DLC.png
LABY
RNTH
Inescapable labyrinth Disables achievements Permanent Curse of the Labyrinth.
DLC.png
L0ST
Hopelessly lost Permanent Curse of the Lost.
DLC.png
VNKN
0WN
Forever unknown Permanent Curse of the Unknown.
DLC.png
MAZE
Unending maze Permanent Curse of the Maze.
DLC.png
BL1N
D
Incurable blindness Permanent Curse of the Blind.
DLC.png
CVRS
ED
Horrible curse Permanent Curse of the Cursed.
Curse Immunity
DLC.png
N1TE
L1TE
Illuminate darkness Disables achievements Provides immunity to Curse of Darkness.
DLC.png
THRE
AD
Escape the labyrinth Disables achievements Provides immunity to Curse of the Labyrinth.
DLC.png
F0VN
D
I once was lost Disables achievements Provides immunity to Curse of the Lost.
DLC.png
N0W1
KN0W
Know the unknown Disables achievements Provides immunity to Curse of the Unknown.
DLC.png
PATH
F1ND
Stay out of the maze Disables achievements Provides immunity to Curse of the Maze.
DLC.png
BRA1
LLE
Heal the blind Disables achievements Provides immunity to Curse of the Blind.
DLC.png
BLCK
CNDL
Total curse immunity Disables achievements Provides immunity to all curses.
Damage Modifiers
HARD
HARD
Full heart damage Isaac takes a full heart of damage from all sources.
BRTL
B0NS
Twelve heart damage Taking damage instantly kills Isaac.
D0NT
ST0P
Don't stop moving Isaac takes damage if he stops moving.
THEG
H0ST
Damage on a timer Every 45 seconds, a ticking will begin, and after 5 seconds, Isaac will take 1/2 heart of damage. Damage increases to 1 heart in the womb and below. Having invincibility during the time when damage should be inflicted prevents the damage.
30M1
N1TS
30 minute limit Gives a time limit of 30 minutes to beat the game. When the timer hits 29:45, a timer starts ticking, and after 30:00, Isaac takes damage every second.
Control Modifiers
DLC.png
1CES
KATE
Ice physics Makes the ground slippery.
DLC.png
BRAV
ERY
Bravery Isaac fires tears in the same direction that he moves. Removes the normal ability to fire tears.
DLC.png
C0WR
D1CE
Cowardice Isaac fires tears in the opposite direction that he moves. Removes the normal ability to fire tears.
DRAW
KCAB
Reversed controls All movement and firing keys are reversed.
DLC.png
AX1S
ALGN
Axis aligned controls Isaac cannot move diagonally.
Camouflage
CAM0
K1DD
Camouflage player Isaac blends into the ground.
CAM0
F0ES
Camouflage enemies All enemies blend into the ground.
CAM0
DR0P
Camouflage stuff Pickups and items blend into the ground.
WH0A
WHAT
Camouflage everything! Isaac, enemies, pickups, and items all blend into the ground.
1MN0
B0DY
Invisible player Isaac becomes completely invisible.
BL1N
DEYE
Invisible enemies All enemies become completely invisible.
Player Appearance
THEB
LANK
The blank Isaac has no face.
KAPP
A
Grayscale Isaac turns gray.
H0H0
H0H0
Christmas Isaac wears a Christmas hat.
T0PH
EAVY
Big head mode Isaac's head is large.
T1NY
D0ME
Tiny head mode Isaac's head is small.
PTCH
BLCK
Black body Isaac and his tears turn completely black.
Visual Effects
TEAR
GL0W
Glowing tears Disables achievements Isaac's tears glow.
BL00
00DY
Extra gore Makes a lot more blood appear after enemies die.
HUD Modifiers
B00B
T00B
Cathode rays! Applies a filter that makes the game look like it's being played through a cathode ray tube.
DYSL
EX1A
Dyslexia All in-game text is rearranged.
KEEP
TRAK
No HUD Removes the HUD entirely. This affects the map, health, consumables, held items, pickup text, floor names, and more.
MED1
C1NE
Mystery pills All pill names and descriptions show ???.
FACE
D0WN
Mystery cards All card names and descriptions show ???.
Enemy Modifiers
CHAM
P10N
Champion enemies Disables achievements All enemies turn into champions if possible.
C0CK
FGHT
Charmed enemies Disables achievements All enemies are permanently charmed.
C0NF
ETT1
Confused enemies Disables achievements All enemies are permanently confused.
FEAR
M1NT
Scaredy enemies Disables achievements All enemies are permanently scared.
FRA1
DN0T
Skittish enemies Disables achievements Every few seconds, all enemies become scared.
CLST
RPH0
Asocial enemies Disables achievements All enemies are permanently charmed and scared.
Sound Modifiers
FART
SNDS
Farty sounds All sound effects are replaced with farts.
SL0W
4ME2
Movement tempo Music speed is affected by Isaac's walking speed.
HART
BEAT
Health tempo The lower Isaac's health is, the slower the music is.
ANDA
NTE
Downtempo Music is slowed down.
LARG
HETO
Downtempo-- Music is significantly slowed down.
ALLE
GR0
Uptempo Music is sped up.
PRES
T0
Uptempo++ Music is significantly sped up.

Trivia

  • Many of the special seeds can be found by using either the Fortune Teller or the Rules Card.
  • Some special seeds were shared with the community by the developers.
  • If an item that would appear on a seed isn't unlocked yet, it will be replaced by another item that is unlocked.
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