XXI - The World
CardRebirthUnlocked
How do you unlock XXI - The World?
Verified starting unlockSource data confirms that no unlock is required.
Reveals the entire floor, except for the Super Secret Room and Ultra Secret Room.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking XXI - The World leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13