Invaders Keys
Arrow up or space - Fire If the attacking spaceships comes all the way down to your spaceship, you lose two lives.
Arrow down or M - Fire a missile Bonus lifes every 10000 points.
P - Pause on/off When the ufo passes - try to hit it, when you do you gain 1000 points and a new missile.
S - Start the game 500 points for completing each level.
Left arrow - Move spaceship to the left The attacking spaceships may have one more bullet on the screen for each level, the game also moves faster.
Right arrow - Move spaceship to the right You may have 6 bullets on the screen at any time (and only one missile)
Escape - End the game currently playing  

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