Action takes place in all coordinates, so keep on the lookout above and below, as well as left to right. There are few lifts, maybe only one, which takes the action face to face. No escaping up a lift in this one. However, the map has so many twists and turns, should you deem a firefight too intense, simply turn tail and haul. After a couple turns, it's most likely your opponent has encountered someone else, taking the heat off.
Ambient lighting is the rule of the day, really adding to the already-massive effect of the map.
You just feel like you're playing in a real structure, perhaps an old temple or something. Item placement has been tweaked, and quite good. No hyperblaster or BFG, but I believe the rest of the gang is here. Prepare yourself for a projectile-hurling good time. Various armors are scattered, so if you see one, don't procrastinate, get it and use it.