Valve recently made Portal free to celebrate the launch of Steam on Mac. With more than 1.5 million downloads since the switch was flipped, Valve is quickly introducing their reality-altering shooter to a legion of newcomers before revealing too much about Portal 2. We should know plenty more about Portal 2 at E3, but driveshaft48 is already curious how Valve can possibly top their work on Portal:
"I absolutely loved Portal. However I am curious to see what they'll do with this one. They need to add gameplay elements to change thing up, but seeing as what they've already done, it'll tough to make ones as good as what they already have."