Aliens vs Predator 2 singleplayer custom map titled "Limpboy".
Map author: Hammer aka Hamm3r.
Limpboy is an ok corporate-based map. In Limpboy, you play as Ivan. There are no missions as you just have to get to end of the level. This is fine, but it is a very short map. Limpboy is really a preview of what Hamm3r was experimenting with at the time in his lead up to his Infestation campaign. The level layout is the typical Weyland-Yutani style corridors and rooms. Just be sure to not pass the ammo box at the start of the map as it contains the hacking tool. It's a really odd place for the ammo box to be.
Hamm3r is known for scripting highly aggressive alien ai which pounce at you often with lots of sneak attacks. In replaying this map I had forgotten where the aliens strike. At 2:14 I saw a grate and thought, hmm I bet an alien would jump out there. Even with my suspicion, I still jumped when the runner pounced out. I recommend playing this map before Infestation as a warmup.