Testosterone Monkey
The read me says, Arena Map for 2-8 that has been updated from it's M-1 version. I don't see how 8 would fit, but I will give it a try with six. A small lava based level with ledges, dark tunnels a couple of transporters and some secrets. Watch the lava pits, a couple of them will take a gernade hop to get out off. Really a overkill on detail, there is so much that this author did that it is "claustrophobic" at times....This one would be best with KTMWTB.
Levels in map "Testosterone_Monkey":
Testosterone Monkey