This sounds ridiculous, but World of Goo combines a story line that is very affecting by any standard, graphics that leave players stunned and amazed and a level of game play rivaled by no other game currently on the market. It’s that good. For Windows, Mac, Linux or WiiWare
If you enjoy challenging puzzles, you should try “Vision” from Neutral. In this free, Myst-style Flash game, you are asked to escape from a mysterious room. You will need to solve a number of puzzles, including finding and using objects and figuring out mini-puzzles within the room to open boxes, compartments, etc.