This map has a discussion topic which can be visited here

An unofficial sequel to the original Big Drop, the idea for this map was spawned by a friend who saw Big Drop and started commenting on how he wished the map had this or that feature.

Like the original Big Drop, the premise is simple -- start at the top and fight during freefall. That's where the similarities end. Big Drop 2 has game_player_equips so cheating is not needed, a few rudimentary effects, and most importantly, teleporters at the bottom that send the players back up to the top, in effect creating infinite freefall.