These updates are known as Booster Packs. They occasionally released updates to Afterbirth † that incorporated certain high-quality and popular mods. Nicalis, the game's publisher, also created mod tools for easier creation of community mods with the release. Afterbirth † is an expansion to The Binding of Isaac: Afterbirth that was released on Januand costs $9.99.įor a list of the pre-release blog posts, see The Binding of Isaac: Afterbirth † (Pre-Release).