checked-no =>Skip Guardians: When you reach a guardian, move to the top left corner of the screen. Many guardian bosses will disappear if you do this. =>Stage 4 Boss Easy Kill: If you have 3 extra ships, ram him with all three and with your last ship use rapid fire on him for about 10 seconds. When he dies you will get the bonus level. =>Hard Mode: Beat the game once, then when the title screen reappears press [SELECT] to replay the game at a harder difficulty.