Killzone: Liberation is, without a shadow of a doubt, one of the most highly-polished and brag-worthy games that the PSP has. A lot of time and money has gone into developing the game, and it shows. This makes KL an absolute must-buy, and was reason enough for me to keep my PSP rather than getting rid of it and relying on my DS. It's really that good, and with a huge single-player campaign and the satisfying multiplayer, it's a game I'm going to be playing for quite some time. Now strap up and get this game, soldier. I'll see you in-game.