space station the boxes are secret Secret teleport when you want to kill but next year will leave more hell in a secret life teleporter secret boxes when you do not see when you run very fast when they kill the map but next year editaras things Doom Builder to play the map you enjoy it.
Zero-mention Deathmatch map with ambiguous description and a logo which implies monsters.
That aside, there are floating exclamation marks.
Tested on GZDoom 2.1.1 x64 under Brutal Doom v20b.