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1. You need 3 BF to open up the dungeon entries. The items you need are ALWAYS in the last dungeon level (the 3rd)
2. You need to find BF keys again per Act and then have no access to the BF area of the act before.
Act 1 => 3 keys (or 4, one is a joker)
Act 2 => 6
Act 3 => hmm, I think 6 again, though I always missed one.
Act 4 => I found 5