Every now and then a game has a turning point where you realize you're not just playing a great game, but a true classic. For me, it was the transition to 3D with Grand Theft Auto III. The bird's-eye, top-down gameplay of the previous games was fun enough, but when the series made the switch to a fully 3D game thanks to the PlayStation 2, the game became much more immersive and started a new genre of videogames.
What moment in the Grand Theft Auto series was a #gamechanger for you? Post that moment in the comments at the PS Vita blog and you'll be entered for a chance to win a PlayStation Vita and a launch game of your choice.