As far as hours go, pokemon or super smash bros melee.
However I think Sonic 3 and Knuckles will take the crown, I've completed that game about 100 times, know the location of every bonus stage ring, how to complete every sphere grid and I know how to glitch Ice Cap Zone Act 1 by looking down on the sliding rock. I'll be bored, put it on, and go 0 ring the death egg for the funs and for the glorius boss music. Oh and the Doomsday Zone, because it's the Doomsday Zone.
However I think Sonic 3 and Knuckles will take the crown, I've completed that game about 100 times, know the location of every bonus stage ring, how to complete every sphere grid and I know how to glitch Ice Cap Zone Act 1 by looking down on the sliding rock. I'll be bored, put it on, and go 0 ring the death egg for the funs and for the glorius boss music. Oh and the Doomsday Zone, because it's the Doomsday Zone.