A few hours after Adrian Shephard and his squat got scattered allover the Black Mesa Complex, headquarter sent a rescue team to search the lost crew.
I had no idea what this would be when I downloaded this mod. As it turned out, this is crazy of sorts. I liked the whole gameplay very much. It's very long, took me a whole day to finish it (not a continuous playing, though). All of the ideas (intensively puzzle-based) are pretty sophisticated. The part where I spent a significant amount of time was the 'metal bar would be useful' part, it was because the pick-able metal bar did not load properly and the level needed to be reloaded, which fixed the problem. The overall impression is outstanding, the mod is indeed very hard, both the puzzles and the action, and it's finished with a great ride in a train (which I liked a lot!). One of the finest works done in a mod for Half-Life I've ever seen.