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Possible Duplicate:
How do you open the barred doors in the Binding of Isaac?

I ran into this gated challenge room during a recent Binding of Isaac playthrough (with Maggie, as you can see). I had definitely killed the enemies in the room as the entrance door reopened but this one did not. I've been able to enter challenge rooms before without much fanfare. Is there something extra I have to do to open this door? Is Maggie not allowed in weapon rooms?

No challenge! Cry!

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marked as duplicate by mordi2k, Mana Nov 9 '11 at 0:24

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 6 down vote accepted

Challenge rooms can only be entered if the player has full health counting regular hearts and soul hearts, or if they can bypass it with the Nail item or with the Lord of the Pit item.

Since it looks like you don't have either of those items (you need to complete the game several times to get the nail and the Lord of the Pit changes your appearance), you probably don't have full health. Once you collect enough hearts or use the Yum Heart item enough to return to full health, the room should open.

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Aren't soul hearts irrelevant? Or are you saying being down one regular heart but having a soul heart will let you in? – Raven Dreamer Nov 5 '11 at 1:59
@RavenDreamer That is exactly what I am saying. – murgatroid99 Nov 5 '11 at 3:04

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