Suspended is one of my favorite interactive fiction games ever. I originally played it as a kid back when it was released, and it stuck with me. So last year I replayed it (from the Lost Treasures of Infocom collection) and was amply rewarded for my time. The game is hard, but not because of a lot of puzzles. There are really very few puzzles -- they just happen to be very tricky. Getting your robots to do what you want, and figuring out what they are "seeing" is loads of fun.
Absolutely worth playing.
