Scores:
Level-Bonus: Level * 1000
Time-Bonus: Seconds * 1
Health-Bonus: Health * 10
Kill-Bonus: Kill * 1000
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[left arrow] ... move left
[right arrow] ... move right
[up arrow] ... jump
[space] or [left mouse] ... fight

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MediPak - more health

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Move the mouse to the left or right to fight.
Collect the Med Packs always so late as possible.
If you jump, you can not be catch by the aliens.
The more time in the level, the more points.