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Shoot down the evil aliens that try to invade earth.
Simply touch where you want to shoot at.
The bullets will take some time to reach this position.
Be careful you do not run out of bullets.
The supply boxes must reach the ground in order to receive additional bullets and heal.
It lets you navigate the immense wealth of the Wikipedia in a simple, intuitive and enjoyable way.
Discover new information and unexpected connections between topics using simple gestures.