12. Gran Turismo 5 (2010, PS3) - 10.74 Million
Another seemingly forgotten franchise powered entirely by a diehard fanbase, Gran Turismo has been playing cultural short thrift to Forza in the 'realistic driving game' stakes for years, but that didn't stop it rocketing to a sizeable - and franchise-sustaining - 10 million copies in 2010. Gran Turismo is what tends to be referred to as a 'legacy franchise' - one that carries with it the lifeblood of PlayStation. Polyphony Digital have remained by Sony's side since day one - their magnum opus being the epic third instalment, A-Spec, which shifted 14.98 million units in 2001. Forza may continue to have the edge in terms of physics handling and intricate car deformation, but there'll always be a special place in many gamers' hearts for Gran Turismo.