What's an honest dead guy to do?
You set off on a trek that takes you through a gorgeously illustrated world, filled with characters from Mexican folklore. The puzzles are beguiling and enough to keep you challenged for many days of play. It's an extremely elaborate setting, and I for one had to repeat many of the set-pieces numerous times, but don't despair, it's certainly worth the effort.
How many games even try to be like this? How many games so much as approach folklore and culture, let alone combine them with a dash of sci-fi? (This would make a great animated movie, by the way. Hint hint.)
Charming, sweet, innovative and very involving, Grim Fandango is one of the best PC games ever made.