Video Game suggestions for 08

Since I'm going to finish Episode Two before school begins, I'm going to need something to de-stress once my classes reach their full swing.

The Necessary Requirements:

1. Short, or allows for quick play.

It's important that I can play for as few as 30 minutes or up to 4 hours should I be so lucky. Despite being a short game, Portals required a weekend of on-and-off again playing, and the level design was perfect for people like me.

2. Not necessarily system intensive.

You wouldn't think that a MacBook Pro that sold for $2,499 would have a hard time running contemporary games. Video cards are really important for the modern game, and the mac doesn't have a recent enough card to make games scream. Games like Oblivion, year old games, run smoothly. Processor and Ram issues are practically non-existant.

3. NO MORE MMOs.

The idea of spending money per month for intermittent activities doesn't appeal to me. It shouldn't appeal to yourself either. For 15 dollars a month you can buy used games and nary a cent more.