That has got to be one of the best things I have ever seen in a dungeon. I mean. I was just shooting some blocks, out of pure bordem, (I was soling) when suddenly this wolvers spawn behind me. I killed them all, and thats when I saw the key. I was wondering where the hell that came from. But, being inquisitive, I just picked the key up and carried it with me. After butoon room I saw a gate, inserted the key, and got some boxes! This is the sort of stuff that OOO shoul be working on. I mean, the Jelly Farm levels are like one of the best ones ever! Except for Perimeter Promenade in my opinion. Anyway, I suggest that that OOO have some of the new upcoming levels have these sort of 'secrets', optional things which lead to lott. With the amount of loot leveling in accordance to how tough the secret is. And if they already are/have... Well that just makes it more epic.
I think it's fun too, especially since, if I remember correctly, these are some of the earliest levels, wait maybe that was Aurora Isles, but anyway, there have been a few topics on this recently, and it has been there for a while, so it's still fresh for some, even after several months.