Modding for The Binding of Isaac: Afterbirth+ and Repentance isn't just a feature; it is a second renaissance. Want Isaac to start with a sword? Want to fight a boss that is literally a sentient meme? Want to turn all the coins into funny frogs? You can do that.

Happy dodging.

There comes a moment in every Isaac player’s life. You have killed Mom’s Heart 47 times. You have unlocked The Forgotten. You have cried over a bad Soy Milk roll. Now what?

If you install mods before you have defeated Mom (the first time on that save file), the game will lock your achievements. You will still get the item, but the "Mom's Heart" kill won't count toward progression.

Now go forth. Make Isaac fight Cthulhu. Turn the tears into lasers. And for the love of God, do not install the "Baby Plum voice actor" mod unless you want nightmares.

But before you turn this game into a psychedelic fever dream, you need to know the rules of the road. Here is your step-by-step guide to downloading Isaac mods without breaking your save file. Unlike most Steam games where you can just "subscribe and forget," Isaac is fussy .

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