Pause the game and type “RUSSIAN AIR”, then unpause the game. Press ‘N’ to skip levels. This doesn’t work on all versions.
*** Halfway and End Monsters ***
SNAIL: Shoot at eye, avoid mines.
ALIEN: Shoot eyes at either side at top. Scroll back and shoot center eye.
SPIDER: Destroy as much web as possible. Fly down to face spider and fire continuously.
CRAYFISH: Travels in figure eight. Stay below and fire in it’s face.
SNAKE: Attacks from left of screen.
DRAGON: Shoot the side heads first, then tail, then main head.
HEAD: Shoot both eyes, avoiding laser fire and extending tongue. Shoot at head when tongue goes in.
TANK: Use missles
GRAND SPACESHIP: Shoot all cannons until totally destroyed.