10. Portal (PC
)
This may be the game that makes me give computer FPS a chance. The wonderful physics puzzling of the portal gun progresses nicely, teaching you all of the different things you can do with your "weapon" at a reasonable pace. GLaDOS is nearly a perfect character (honorable mention to the turrets) with the writing for her character, and the song in the end credits alone is almost worth the price of the game when its discounted (often). The game didn't overstay its welcome with the part after the test chambers becoming less straightforward but still using what you had learned. As a result of how good this game is, I can't wait for the sequel which seems to be a more complete game with the addition of new mechanics and will force me to buy a computer for the first time.
Primarily an RPG player but have interest in any game that will make me think.