Kart racing showdown: Sonic Transformed vs. LittleBigPlanet vs. F1 Race Stars

This holiday season saw the release of three fairly high-profile kart racing games, and not a single one of them had anything to do with Mario. But which one is worth your limited holiday money, and how do they stack up against each other? GamesBeat put F1 Race Stars, Sonic & All-Stars Racing Transformed, and LittleBigPlanet Karting through their paces to find out.