Base Defense is a single/cooperative modification based on horde-style and RPG systems. It's awesome, you should try it ;)

h4wk99 says

10/10 - Agree Disagree

though the mod has some bugs, most notably the ai-pathfinding, it is one of the best co-op half life mods in my opinion. Also the game needs more maps, more quests and new weapons. graphics are ok, though it could have some better models/textures, but in the end gameplay matters(at least for me) and the gameplay of this mod is superb i think and really really fun!

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9.4

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Highest Rated (7 agree) 9/10

Great mod, really made the traditional Half-life mechanics feel modern in-tune with the Horde-style systems we see in most shooters and stays fun throughout. Alot of balance problems though, most noticeably the AI-pathfinding which is so horrendous at finding players hiding in spots that its game-breaking at times. However with 4 players running around the map proper, its a blast.

Dec 1 2012 by Hendrich