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Those who own The Binding of Isaac: Rebirth should almost certainly check out The Binding of Isaac: Antibirth. Antibirth is a massive and free fan created mod that has been two years in the making. This mod adds in two new playable characters, over 90 new items, over 80 new enemies, over 16 new bosses, and over 4,000 new rooms.

The mod was just released today. And did I mention yet that it's free? This mod is free. You should probably know that this big, lovingly created mod is totally free.
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