That game's a keeper...or is it?

[pots555]

I just bought Portal 2.  Each time I buy a new game, I think it will be a keeper.  When I decided to buy Portal 2, I traded-in Crysis 2.   I got a good deal for it.  But one week ago, when I finished the single player campaign, I never thought I would part with it.  And yet, here I am.  Crysisless.  Looking at my collection, I wondered wich game will never be traded.  Here is my list, for the fun of it.  And, as always, I would be interested in knowing yours.

Batman Arkham Asylum, Fallout New Vegas, Dead Space 2, Divinity II the dragon knight saga, Dragon Age Ultimate edition, Bioshock 1 and 2, Portal 2, Alan Wake, Enslaved, Tron Evolution and the Ultimate Sith Edition of the Force Unleashed.