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Afterbirth Custom Challenge Launcher
Make your own challenge runs!
Created 2 years ago
This is my custom challenge launcher for Afterbirth.
You can create your own challenge runs and share them with friends.


-Customize starting HP and consumables
-Choose starting trinket and card/pill/rune
-Choose starting items
-Enemy and boss health multiplicator
-Simple item pool editor
-Load/save challenge runs and share them through codes or files
-Random run generator

The item pool editor is a very simple tool which let's you change/combine item pools. For example you could make treasure rooms contain angel room items instead of treasure room items or you could make shops sell devil items AND shop items.

If you find any bugs or you have any suggestions feel free to post them and they might be fixed/included in the next version. Also I'm not a native english speaker, so if you find any GUI text which is bad english feel free to correct me.


Just download the binary and start the .exe file. The tool should automatically detect your rebirth folder. If it doesn't it will prompt you to enter the root path of your Binding of Isaac - Rebirth installation.

Modify anything you want and hit the "Play" Button to start the run.

Using this tool may override following files. So it may collide with other mods which are using the same files:



x 1053

- Added "Blindfolded" option

- Added "Deep Pockets" item

- Fixed bug where modifying itempools lead to an error message on starting the game.

- Added new items/trinkets and character unlocked by the ARG

- Minor bug fixes

- Randomized runs now randomly add items to the ban list

- Improved UI

- More "Random" buttons

- Ban items

- Choose a character for your challenge!

How do I get the rebirth version
you just need to search "RebirthCClauncher
a lot of people seem to be asking how to launch the challenge so this is how i did it. 1. make a challenge, i set a character as i was not sure if it work with the "any character" setting. 2. press play. 3. get onto a save file make a new run, then choose the character that you set the challenge launcher to.

Sorry if that was a bit confusing
P.S don't make the run to ridiculous e.g 50 sworn protecters as that will crash the game

P.P.S English is my second language so don't judge
So, I was going to download this on mah MACBOOK, but now I realize that I FUCKING CAN'T DO THAT! SHIT!
Haha, this was me on a different computer a few minutes ago. Meh.
Was gonna download the mod, then saw a good little number of comments, some asking how to play their challenge, one saying they keep crashing, a russian person, and other person saying they crashed, yeah, most likely not going to download.
How do I actually play the challenge I made?
This is perfect for challenging challenges
Where do i find my root path to my rebirth folder?
i was wanting this a long time ago and i finnaly found it
Great to do real challenges and mostly dumbs runs!
Maybe because you made your run a bit ridiculous? i don't know but thats what happens to me...
the game just crashes even with one item
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.