XXXXXXXXL

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

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

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, as they can significantly slow down your progress by potentially teleporting you to the other side of the map. Picking up the Cursed Eye is not recommended for the same reasons.