Win Grand Prix mode to unlock the Red Gazelle, Iron Tiger, Deepclaw, Crazy Bear, Big Fang, Wonder Wasp, Crazy Boar, Super Piranha, Mighty Hurricane, Space Angler, Mighty Typhoon, Green Panther, or Blood Hawk. The ship that is unlocked is random. Also, the higher the difficulty setting, the more ships will be unlocked (one for novice, two for standard, or three for expert).