Sector Tag, also known by its file names _ST.MAP or ST.MAP, is one of three demo maps included with Duke Nukem 3D. Along with Zoo and Sector Effector, this map was intended to demonstrate the technical capabilities of the Build engine.
This map gets its name from the fact that sectors — unitary geometric spaces in the Build engine — can be assigned a "lotag" or "hitag" that may trigger special effects. The various effects are demonstrated in isolated rooms on this demo map, where each room is accessible via a teleporter in a massive hall of numbered teleporters.
Video
* ST.MAP - Sector Tag (Test Level) *
Map
Development history
Sector chronology in v1.3d. Bright blue=oldest; bright red=newest. Oldest sectors in ascending order include: room with teleporters 1-10 (sector 0), teleporters 1-10, room through teleporters 1 and 2 that are inexplicably combined and mislabeled as room 7 and 2 (demo of water-based sector).