Other than a Ratchet and Clank game?
I guess it'll be Pokemon and Final Fantasy Tactics Advanced 
I think StarFox 64 3D, Mario Smash Football and pretty much all Super Smash bros. games. When I pick those up, I'm playing forever.
In my opinion I think the Future series of Ratchet & Clank is much more addictive compared to the original,The games i most addicted to at the moment are Call of Duty Black Ops 2 Ratchet and Clank Qforce Rugby World Cup 2011