The Portal games were two of the games that I already owned on the xbox that I found worthy enough to purchase again on steam. Both games are quite wonderful, and are equally deserving of a playthrough.
+ The graphics are a bit dated in terms of newer games, but look wonderful for their age, and run smoothly on most machines. I will sacrifice top notch graphics for playability any day, and this game doesnt make you sacrifice either.
+ Voice acting is strong, clear, and adds another layer of awesome for this game.
+ The game is a puzzle platformer game with enough challenge to give your brain a workout, but not difficult enough to make you want to throw your laptop out of a window.
+ It has GLaDOS in the game. I put this under pro simply because her commentary throughout the game is hillarious.
+ The game has achievements. Pretty self explanatory.
- There is little replayability for this game, other than to hear GLaDOS speak.
- I experienced some crashes at inopportune times, but could not figure out if it was a hardware conflict, or something else.
All in all, this is one of the most fun games that I've ever played. The humor used within the game is right up my alley, and the game itself runs well and gives me enough of a challenge to feel satisfied after playing it. I do feel that most games this old aren't worth the full price on Steam, but this game is an exception- largely due to the amusement factor. I would rate this game an 8/10.