Soldato
Good lord. Paging @Chris1712 who introduced me to it. I remember distinctly using binoculars to centre the camera on the guards' heads and then one shotting them all with the silent pistol. It sort of broke the game but it was still fun, I remember shooting through certain material but not others, as well as the procedurally generated terrain being particularly fascinating.
loved that game...but got to say it was the hardest game I ever played as in you could not save progress, it took me ages to actually finish it, good memories
Same, it's still in my all time top 10 games list. I was in the beta test for both IGI and IGI2, was great back in the day when beta testing was done prior to a game's release rather than today's system of releasing unfinished and broken games and cynically palming testing off to the paying customers. Also, Eidos sent every tester a free copy of the game too, via a disc in the post.