Mario Galaxy.
I felt a bit screwed by the Orange Box honestly. I paid $50 for HL2 and $20 for Ep1 and then Value decides to give those two games to me again in the Orange Box (and don't start with that BS "you can give it away to a friend" shit because everyone already played those two games). Basically for me, I had to pay $50 for Ep2 and Portal but luckily, BestBuy sold it for $25 on BF (PC version) which worked for me.