Just wondering since I own the original already trough orange box. The original is a great game but it never got really challenging enough for my taste, just wondering if this would fix it.

If you want challenge there is the Still Alive challenge rooms that come with the game, I think there is 12 or 14 of them, and they are pretty good. I bought Portal even though I have Orange Box on steam and 360 and I did not regret my purchase. It all depends on how much you like the game, since the main portion of the game is still the same, except for the still alive challenge rooms.

Why not, you know? I love portal and I will support it. If there is any one I want to throw money at on xbox marketplace, its valve.