too difficult to say only one. My favourite are: Monkey Island Planescape Torment Dune (the first) Max Payne Bioshock (the first, the second was too boring)
I like all the PC games but the most favorite is Dead2Right and GTA Vice City. I like to play all types of games...!! I am a big lover of games...!!
I really like playing Age of Empire I do really like building stuff so I prefer playing this type of game even when I was young. I used to play the old and now the new Age of Empire