Cannot believe I played this on the first home pc I ever owned. I found alot of games at the time a bit tedious because they just seemed to be running round repeatedly shooting at stuff for no particular reason, then this came along - a proper narrative and some brilliant creative set pieces.
At the time "accelerated" graphics were quite new, so anything that wasn't just blocky squares looked amazing. Now it will look totally dated ... but gameplay is gameplay!
Loved the environments they built, using a modified Quake engine, and just taking it all to a new level of immersion.