What do you consider the best game of all time ?

Well there are so many different sorts of games

RPG: Final Fantasy series, Dragon Quest series, KOTOR series
Action/Adventure: Metal Gear Solid series, Grand Theft Auto series
FPS: Farcry, Battlefield series (online only)
RTS: Rome Total War
Stategy: Civilizations
Platform: Ratchet & Clank
Fighting: Tekken series, Soul Calibur series
Racing: Gran Turismo series, NFS Underground series, Ridge Racer series

It also depends on situations like, playing it alone, with friends or online.