This is a map started by Hayt... he left it unfinished but gave me the source code so I finished it up. It has text display telling what levels enemies are on, and some neat low-g areas in the middle of the map to play around in. This HLDM version uses game_player_equip to start you out with a jump pack and better guns. Also has monsters so it's a fun 'kill the baddies' romp in 1player if you are up to it.

EDIT 6-3-08: :o!

I am still in awe of how many downloads this map has gotten over the years.