When I started this mod, I had no context for it. After I played it, I learned that it's highly regarded as a well-known early Half-Life mod. And that came as a surprise to me, because in my experience this is a steaming pile of dogshit. Dragging Kate along with you is so annoying, not just because the follower mechanics are broken and buggy (although they are), but because she will constantly run into the middle combat and get herself killed, which is a fail state. It is so frustrating to fail because the AI was being an idiot, through no fault of your own. But the biggest fault of this mod is the god awful level design - just endless winding corridors full of locked doors, with no clear direction on where to go and what to do. And it doesn't even look good visually! I guess you should play this mod if you want to experience the early history of Half-Life modding, but there are way better early mods and you should know what you're getting yourself into with this one.