Keys
 | 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 |
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Instructions/rules
| 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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