It was a very nice map, here's what I remember.
Deathmatch; not too big, I'd say 3 - 6 players ideal load
- One powerup was located on a trap (I'm not sure if it could be activated or not from a remote button). There were spike walls. It could have been an armor or a shieldbelt;
- Main color was dark gray, almost black, maybe a bit of blue?
- There were jump pads in a main room that went above a lava pit;
- 90% It had a custom metal/hard music [EDIT! Might have been using the old Mayhem.umx? Maybe, maybe not]
Not sure, but I swear I remember the Quake 3 jump pads so it had those textures as well
The name might have had something to do with "house", "pain", but maybe I'm just imagining things. This name was most likely the "full name" of the map, not the filename. Other things: slaughter, hell, rage, suffer, murder, etc. Full name was "house of something" or similar stuff, "arena of pain". But the filename was different. Updating » Most likely it was named after someone, like "Dude's arena" or something. Also, again most likely it was part of a small map pack
More info as I keep searching myself: maybe it was included in some random map packs (very small ones), stuff for clans I think
for any help