Map Labs: Back on Track - Cold Hard Steele
Part of "Map Labs #9: Back on Track." A personnal favorite, as it reflects the gameplay style of older shooters (mostly Classic Doom). The visuals and setting are also great. I'd highly recommend it.
You can get Map Labs: Back on Track as a map pack here: https://www.runthinkshootlive.com/pos...
It's highly recommended to have Half-Life 2 and/or Half-Life 2: Episode Two installed when trying out this map pack.