Keys

• Arrow up or space - Fire
• Arrow down or M - Fire a missile
• P - Pause on/off
• S - Start the game
• Left/right arrows - Move ship to the left/right
• Escape - End the game currently playing

Instructions/rules

If the attacking spaceships comes all the way down to your spaceship you lose two lives.  Bonus lives every 10000 points.  Try to hit the UFO - you gain 1000 points and a new missile.  500 points for completing each level.  You may have 6 bullets on the screen at any time (and only one missile).

Play Retro Invaders