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Added in Afterbirth
Challenge number
Isaac App.png
Full red heartFull red heartFull red heart
Available rooms
Item Pool Treasure Room.png: yes          Item Pool Shop.png: yes
Boss Mom's Heart.png / Boss It Lives.png
Added in AfterbirthGold Heart Gold HeartGold HeartComplete challenge #21
Unlocked by
Added in AfterbirthXXXXXXXXL Defeat Mom for the 1st timeXXXXXXXXLXXXXXXXXL

XXXXXXXXL is Challenge #21. This challenge changes all floors to be the size of XL Womb, but does not combine the floors of each chapter. Your goal is to defeat Mom's Heart, It Lives, or The Lamb.

Difficulty[edit | edit source]

Due to the floors being much bigger, it makes important rooms like Treasure Rooms and Shops take significantly longer to find, which can make your run difficult if you have rather weak items. It also makes Secret and Super Secret Rooms much harder to find. Despite the fact that all floors are technically XL, there is only one treasure and boss room on each floor. On the plus side, since there are more rooms, there are more opportunities to generate pickup items.

Strategy[edit | edit source]

  • Items and pickups that reveal the map are very crucial, allowing easy maneuvering between Special Rooms throughout floors.
  • Teleportation cards, such as The Stars and The Hermit, are very valuable, as they allow easy access to Special Rooms. The Emperor is especially powerful, as it can be used to skip the entirety of a floor.
  • Avoid items that teleport you at random, such as Cursed Skull Cursed SkullCursed Skull Icon.pngIf Isaac has less than one full red heart after taking damage, he will be immediately teleported to the last cleared room he was in., as they can significantly slow down your progress by potentially teleporting you to the other side of the map. Picking up the Cursed Eye Cursed EyeCursed Eye Icon.pngGrants charged tears that can be fired in a tight burst of four. Getting hit while charging will teleport Isaac into another room. is not recommended for the same reasons.

Reward[edit | edit source]

The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
MainPageAchievements.png Achievements MainPageAttributes.png Attributes MainPageBosses.png Bosses TarotCard.png Cards and Runes MainPageChallenges.png Challenges MainPageChapters.png Chapters
Isaac App.png Characters MainPageBabies.png Co-op MainPageItems Small.png Items Item Pools Item Pools MainPageMonsters.png Monsters MainPageObjects.png Objects
Red heart.png Pickups BlueBlue.png Pills MainPageRooms.png Rooms MainPageSeeds2.png Seeds Guppy App.png Transformations The Left Hand Icon.png Trinkets