In The Binding of Isaac: Rebirth, the seed determines every item, enemy, floor layout and room in the run. You won't be unable to unlock secrets while playing seeded runs, however they allow you to share the seed with your friend and play the same run together.
Rebirth has over 4 BILLION possible seed combinations, however there are 50+ pre-assigned seeds which have unique effects on the game. This page highlights all the secret seed codes which the developers have added to the game and what each seed does.
Note: Seeds are all 8 characters long and all alphanumeric characters are allowed except the letters I, O, U and V, because they look too much like other characters.
| Secret Seed Code | Description / Effect | Image |
| 1MNO BODY |
Isaac is completely invisible, however you can still see the light effect surrounding him. |  |
| 30M1 N1TS |
Gives you a hard timer of 30 minutes to beat the game. After 29:45 a timer starts ticking and at 30:00 you will take damage every second. | (No image) |
| ALLE GR0 |
Music is permanently sped up. | (No image) |
| ANDA NTE |
Music is permanently slowed down. | (No image) |
| BASE MENT |
Endless run, where every floor is the basement! Due to how the item spawning mechanics work, after the item pool is exhausted, every item will become the Breakfast health up item. |  |
| BL1N DEYE |
Turns all enemies invisible. |  |
| BL00 00DY |
Increased gore effects when enemies die. |  |
| B00B T00B |
Applies a filter to the game which makes it look like a CRT television screen. |  |
| BRTL B0NS |
Taking any damage instantly kills you. |  |
| BRWN SNKE |
Isaac leaves a trail of poop behind him as he walks. |  |
| CAM0 F0ES |
All pickups are now covered in a colour similar to the floor, making them harder to see. |  |
| CAMO K1DD |
The player sprite is removed and replaced with a brown coloured shadow which is similar to the floor colour. |  |
| CHAM P1ON |
Turns every eligible enemy into a champion version. |  |
| CHRS TMAS |
Gives Isaac a Santa hat! (Same effect as 'H0H0 H0H0' - Added in v1.04) |  |
| C0CK FGHT |
All enemies have a permanent charm effect and will attack each other if hostile. |  |
| C0ME BACK |
Enemies respawn when you leave the room and come back. | (No image) |
| C0NF ETT1 |
All enemies have a permanent concussion effect, making them walk around the room dazed. |  |
| C0PY C0PY |
Gives curse of the unknown on every floor. | (No image) |
| D0NT ST0P |
Isaac takes damage if he stops moving. | (No image) |
| DRAW KCAB |
Inverts your movement and firing controls. | (No image) |
| DYSL EX1C |
Ingame text is re-arranged. |  |
| FACE D0WN |
All Tarot Cards when picked up are face down so their effect is always unknown. | (No image) |
| FART SNDS |
Does what it says on the tin - Sound effects are replaced with fart noises. | (No image) |
| FEAR M1NT |
All enemies have a permanent fear effect. |  |
| FRA1 DN0T |
All enemies have a fear effect which turns on and off every few seconds, causing enemies to run away sometimes. |  |
| FREE 2PAY |
Starts you with 69 coins and makes it so you have to purchase all of your items and pickups. |  |
| HARD HARD |
All damage does 1 full heart for every floor. | (No image) |
| HART BEAT |
The lower your health is, the slower the music is. | (No image) |
| H0H0 H0H0 |
Gives Isaac a Santa hat! (Same effect as 'CHRS TMAS' - Added in v1.04) | |
| KAPP A |
Turns Isaac's sprite grey coloured like the twitch.tv Kappa emote. |  |
| KEEP AWAY |
Pickups mimic player movement. |  |
| KEEP TRAK |
Removes all parts of the UI overlay, including map, consumable count, health etc. | (No image) |
| K1DS M0DE |
Causes the Player 2 coop baby to be invincible. | (No image) |
| LARG HET0 |
Music is permanently slowed way way down (More than the ANDA NTE seed). | (No image) |
| MED1 C1NE |
All pill text (names and descriptions) are replaced with ???. |  |
| PAC1 F1SM |
Enemies and bosses cannot be killed, all doors remain always open and bosses have their health slowly drained. | (No image) |
| PRES T0 |
Music is permanently sped up a lot (More than the ALLE GR0 seed). | (No image) |
| PTCH BLCK |
Turns Isaac into a jet black shadow. |  |
| SLOW 4ME2 |
Music speed changes based on how fast you are walking. | (No image) |
| TEAR GL0W |
Tears have a slight glow around them (Hardly noticable unless you have Curse of Darkness). |  |
| THEB LANK |
Isaac has no face! |  |
| THEG H0ST |
Every 45 seconds a ticking sound will start and after 5 seconds Isaac takes damage. A reference to when Edmund stated there would be a Spelunky ghost-like mechanic in the game and it was taken out of context by some of the community. | (No image) |
| T1NY D0ME |
Gives Isaac a teeny-tiny head. |  |
| T0PH EAVY |
Gives Isaac a HUGE head. |  |
| WH0A WHAT |
Isaac, Enemies, Consumables and Items all have a brown filter and blend in with the floor (Similar to CAM0 K1DD / CAM0 F0ES). |  |
Know of any more seeds? Please send them to me!
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