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Font TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat X.pngFont TeamMeat L.png
Full red heartFull red heartFull red heart
Table dividing line 1.png
Item Pool Treasure Room.png: yes          Item Pool Shop.png: yes
Boss Mom's Heart.png / Boss It Lives.png
Gold Heart Gold HeartGold HeartComplete challenge #21
Added in Afterbirth

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. The goal is to defeat Mom's Heart/ It Lives.

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 the run difficult if Isaac has rather weak items. It also makes Secret and Super Secret Rooms much harder to find. Although 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 Isaac at random, such as Cursed Skull Cursed SkullCollectible Cursed 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 progress by potentially teleporting him to the other side of the map. Picking up the Cursed Eye Cursed EyeCollectible Cursed 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.

Notes[edit | edit source]

  • Curse of the Labyrinth can still spawn as normal, combining the two floors as normal, and causing there to be two treasure rooms and boss rooms. The size is unchanged.

Reward[edit | edit source]

Mom Unlocks Mom Unlocks Mom Unlocks
Added in Afterbirth †
The WombThe WombDefeat Mom for the 1st timeThe HarbingersThe HarbingersDefeat Mom for the 1st timeA Cube of MeatA Cube of MeatDefeat Mom for the 1st timeA HaloA HaloDefeat Mom using The BiblePuristPuristDefeat Mom for the first time XXXXXXXXLXXXXXXXXLDefeat Mom for the 1st timeSPEED!SPEED!Defeat Mom for the 1st timeHave a HeartHave a HeartDefeat Mom for the 1st timePRIDE DAY!PRIDE DAY!Defeat Mom for the 1st timeOnan's StreakOnan's StreakDefeat Mom for the 1st timeThe GuardianThe GuardianDefeat Mom for the 1st time Aprils foolAprils foolDefeat Mom for the 1st time

MainPageChallenges.png Challenges MainPageChallenges.png

1. Pitch Black 2. High Brow 3. Head Trauma 4. Darkness Falls 5. The Tank 6. Solar System 7. Suicide King 8. Cat Got Your Tongue
9. Demo Man 10. Cursed! 11. Glass Cannon 12. When Life Gives You Lemons 13. Beans! 14. It's in the Cards 15. Slow Roll 16. Computer Savvy
17. Waka Waka 18. The Host 19. The Family Man 20. Purist
21. XXXXXXXXL 22. SPEED! 23. Blue Bomber 24. PAY TO PLAY 25. Have a Heart 26. I RULE! 27. BRAINS! 28. PRIDE DAY!
29. Onan's Streak 30. The Guardian
Afterbirth †
31. Backasswards 32. Aprils Fool 33. Pokey Mans 34. Ultra Hard 35. Pong
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