This mod is the second in a quadrilogy of mods - Operation Rosenberg, Escape from Area 99, Operation Rift, and Dark Future. I think this is the best mod in the trilogy, but even then it's just alright. The gameplay isn't great, but it is okay. I think the reason I like this mod the most of the three is because it's silly enough to be charming; it introduces a lot of very strange concepts to the Half-Life universe that are completely incongruous with what the series is about, but it certainly is entertaining. But I still wouldn't recommend this trilogy, it's overall not great.