I've bought this game to play when traveling by plane (and I do it a lot). It's that kind of game that really entertains you (and the passenger sitting at your side) for a good amount of hours. It has a great script, where you're part of a Mafia family. Beside the missions you should accomplish, you just can be yourself and start driving around, being a taxi driver, stealing any kind of vehicle, hitting (or even killing) people - if you really want to. In fact you can do whatever you like, and the non-limited scenario provides you an excellent gameplay, graphics and sound, where everything is almost possible! I really recommend it, specially for the Platinum version, that even if it is not the latest GTA, you'll find a great value for money. I've also bought Grand Theft Auto: Chinatown Wars (PSP)
and Grand Theft Auto: Vice City Stories (PSP)
, which is completing my GTA experience for PSP. Each one has different plots, graphics and characters, so you'll never get bored owning all. If you enjoy a mix of driving, free walking and mission based with a bit of crime, this GTA: Liberty City Stories will fill your desires!