Your favourite Sony 1st/2nd party game throughout the 3 Playstation platforms

You can only choose 1, it may even be an upcoming one for the PS3.

I would have to say Shadow of the Colossus. It was an impulse buy but one which was definitely worth it, no game has ever made me feel the way SoTC has.

First Party- GOD OF WAR (both 1 & 2)

Second Party-Rathcet & Clank games

you are making it very hard by saying CHOOSE ONLY 1 lol

Socom (entire series)

 1st party: ummm....hard choice, either Shadow of the Colossus or God of War

 2nd party: Gran Turismo 

more :D

p.s. yeah I know its hard, Sony has fantastic 1st/2nd party games