If we don't count pinball, then...I think it'd be either Max Payne 2, or GTA Vice City. Mi cousin had Max Payne 2 installed on his PC and I'd stay at his home just to play all day and night. Then, in my own PC, I played Vice City knowing nothing about cheat codes or game progressin, so I would just walk around the beach with a bat killing every person in front of me just to get some money, thinking that it was easier than doing the missions. Man, kids are dumb. Haha, just kidding.