Mighty Gunvolt certainly seems appealing at first glance, but if you didn't get this game as an extra it's simply not worth it. While it's a good game, it's also incredibly short, with very little to offer, despite having 3 characters to play with. If the game just made a few more changes to the stages for each character, or simply extend the game a bit it probably be worth more, but as it stands it's best for it to be a promotional item than a package on it's own.