It's almost a shame, really. If TF2 had twice the maps, or if Portal had been just twice as long, I would have happily paid full standalone price to have more of each (the voiceover in Portal would make it worth it alone).

I started playing Portal on Tuesday afternoon, and beat it a couple of hours later. Did all of the advanced maps that evening. The challenge modes (least portals, fewest steps) looks like it will provide some challenge for the gold medals (at least until someone posts a walk through, and everyone goes and just breezes through it). The whole experience of Portal was great though, even the end and the credit song were outstanding. But, for me, it was short enough that it fell just shy enough of "satisfying" and just left me wanting more. I hope we get more, someday.

http://www.newgrounds.com/portal/view/404612

Not bad for flash...