At first, you can choose the character you'll play: Mario, Luigi, Kinopio or Samus Aran (from Metroid), each one have different characteristics and powers, then you'll be immersed into a fascinating galaxy piloting a spaceship that can be powered up in a lot of ways. The more you power up the ship, the easier you'll defeat the enemies and the final bosses of each one of the 8 levels you'll have to pass to rescue the princess.
Good music, good graphics and a story that will hook you again. You have helped Mario and friends many times, but this time will be different. Don't hesitate it's free and you'll be hooked for hours.