How do secret rooms work in Wrath of the Lamb?

Question

Without the DLC, the secret room would've been here guaranteed, as it's the only non-room area with three or more rooms around it:

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Instead, I lose. I get nothing. Good day, sir. Why is that? What changed in the DLC?

This really shouldn't be a new question should it? We've already got a question on bomb-able walls, surely we can just update the question and answer (which is mine) for WotL? I was planning on updating it, just haven't got around to it yet.
@MrSmooth There's actually a few similar questions about the DLC as Yi Jiang noted - gaming.stackexchange.com/questions/73142/… gaming.stackexchange.com/questions/73142/… - but they seem to mostly agree with the old wisdom of "look for a room surrounded by three or more other rooms"
@QAdp even so, it's a duplicate indicating that questions needs an updated answer. You could add a bounty there... This could of course be a bug, or another recent update's unfortunate effect
@QAdp according to the changelog here: bindingofisaac.wikia.com/wiki/Version_History, the newest update screwed up secret and hidden rooms
@badp Thought about it a little, you should have tried to bomb the opposite wall: i.stack.imgur.com/vC7su.png. You would have found the secret room in the green spot and the hidden room in the red. Take a look here and here to find why.

Rachel Keslensky · Answer 1 · 2012-11-21 04:24:35Z

up vote 0 down vote

Assuming this isn't a bug, you didn't find it.

Sometimes Secret Rooms are attached to curse rooms now, which confounds things a bit.

answered Nov 21 '12 at 4:24

Rachel Keslensky
1394

2

And by 'now', you mean, a specific version? – Bora Nov 21 '12 at 10:58

There's no curse rooms in that map. – badp♦ Nov 21 '12 at 12:13

That's a bug. have you tried updating / playing since? – Rachel Keslensky Nov 21 '12 at 13:11

1 Answer