Short and sweet
Thanks to the Valve throwing this out for free (thanks to the Mac on steam thing!) I've finally gotten a chance to play Portal. Wow, am I pleased.
The games way of making the portals work is really something special. I'm surprised how inventive all the portals got throughout the game. Some of them really stumped me at points, but I got them all eventually. Of course there are extra challenge maps for players looking for more of a challenge.
GLaDOS is definitely the best thing about this game. As you play through the game you will hear it talking to you every now and again. The lines written for it are just hilarious, especally towards the end.
The worst thing about the game is that it's short. I completed it in under two hours kind of short. If you can look past that (I know I did since I got it for free) then you have a real treasure.
Let's hope Portal 2 is longer!