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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 10 months ago

This is an official post by the Antibirth team. Proof here.

Five years ago, a young boy took his first trip down into the basement, facing the endless threats below to escape from the murderous delusions of his loving mother. Three years later, he found himself facing the same predicament but with an even greater plague of horrors and peril. Very shortly afterward, a modest few among us decided that even this was not enough. In the two years since then, fate has worked tirelessly to place by far the most fearsome challenge yet in his path. This time, Isaac will face our free and fan-made The Binding of Isaac: Rebirth expansion, Antibirth. So what exactly is in store for him?

  • 2 new characters with unique playstyles
  • 90+ new collectible items to help Isaac fight
  • 18+ new trinkets to swap and strategize with
  • 80+ new enemies to face one after another
  • 16+ new bosses to kill or be killed by
  • 4000+ new rooms to explore and survive
  • A new secret final chapter for Isaac to endure
  • Bigger and greater secrets than ever before
  • Several new or enhanced features for local cooperative play
  • A nearly full and original new soundtrack, evocative of classic Isaac

The Binding of Isaac has had one of the most involved and robust communities of fans around since its initial release and has inspired countless players and developers with its peculiar sensibilities and creative blend of roguelike flavor. As its zealous modding community has proved, it’s only natural that many among us would feel the urge to try to help carry the torch and make it partly our own, but Antibirth was the first and is presently the only Isaac mod to reach deep into the core of Rebirth to enable the depth and scope of a full expansion, aspiring even to the size of the official DLC, Afterbirth. If you’ve become as enraptured with Isaac as the rest of us and you still want more, we’re here to provide our absolute best — and more of it than you’ve ever dreamed of — all for free.


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i cant get it to work it says it isnt reasponding :'(
THIS IS FREAKING FANTASTIC This is done with SO much effort, and it payed off so good! You should have been a team in the actual development, as this could easily slip in as a DLC more expensive than even Afterbirth+
Is this compatible with afterbirth or do I have to deactivate the dlc beforehand?
seeds dont unlock achievements in tboir/tboia crashes when I launch it. I put it in where the "help" area said to, "C:/Program Files (x86)/Steam/SteamApps/common/The Binding of Isaac Rebirth/resources/". Does not want to run. Normal rebirth still works. Any tips?
Make sure Afterbirth is completely deactivated before installing Antibirth. It should work then
My game keeps crashing whenever I start the game, can someone help please?
Make sure Afterbirth is completely deactivated before installing Antibirth. It should work then
Dear moderator, STOP FINING ME AND REMOVING MY COMMENTS!!! i was asking for help you jerk! now sure, delete this, just dont do this to anyone else, because its dumb and its really angering me. thank you, AND DONT REMOVE THIS!!! keep in mind that i had to download the game myself (which took an hour) instead of getting help from you. sorry for being salty, your mod is great, just keep my complaints in mind.
I played it for about an hour. No new places at all. Only new items and that's it. Where the fug is the rest of the content.
To unlock the new levels, you must first beat all of the new bosses in the normal floors( ex; baby plum ).
Someone have a seed to unlock A Secret Exit? I need so much, but is so hard to do
This is an amazing mod in looks and play, if this becomes a real dlc, I'll be a happy man
By far, the best mod this game has, new characters, challenges, rooms, items, enemies, bosses... Hell, even a new soundtrack! Fucking amazing, can't wait to see it grow!
January 20, 2017 - 9 months ago

A new animated Planetarium theme (from Antibirth) is now available!

There is a new DLC search filter on the Browse Mods page.

Added the 50 new babies from Afterbirth+.

The What's New sheet will try to get your attention when there is a new site update.

Fixed some mod icons not changing after being updated.