sentences:  Every area contains one or more bosses, all of which must be destroyed before continuing in the game.Players lose a life if they are hit by an enemy or projectile, with the game continuing at a previously–crossed checkpoint, unless they grab a flashing orb which destroys all on-screen enemies and allows them to continue at the point where their previous ship was destroyed (represented by the icon illustrating the remaining number of ships turning gold).The game ends when all lives have been lost, but the game awards 1-ups when the player scores a particular number of points.