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

• If the attacking spaceships comes all the way down to your spaceship you lose two lifes
• Bonus lifes every 10000 points
• When the ufo passes - try to hit it, when you do you gain 1000 points and a new missile
• 500 points for completing each level
• The attacking spaceships may have one more bullet on the screen for each level, the game also moves faster
• You may have 6 bullets on the screen at any time (and only one missile)

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