The Original Tomb Raider ...aka Indiana Jones and the Infernal Machine
For some reason I stopped playing this after level 6 some ~4 years ago. Thanks to existing cloud saves I was able to pick up right where I left off on an entirely different PC. Didn't take long to get re-adjusted to the controls either. Aside from some random-crash-happiness with the bigger guns (although that mysteriously stopped once I got to Solomon's Mines) it runs quite well. I did have to use an unofficial dinput wrapper though pointed out in the game forum as the game would not work otherwise. *shrug*
Anyway, I've been having a good time with this. Man, I love labyrinthine levels of yore. None of that straight-path, hand-holding, follow the breadcrumbs nonsense of today.