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Planetary Base Defense
The enemy UFO attacks your planetary base with metal balls.
After typing a word, press the space bar to fire.
Your score increases by 5 points, every time you destroy a metal ball.
Your score decreases by 2 points, every time you press a wrong letter key.
Instead of clicking the "Play" button or the "Title" button, you can also press the "1" key two times in a row.