A second player can enter a level any time. Earn points with your friend and unlock together new special weapons and upgrades.
Decades ago, Earth was discovered by aliens. After the first encounter with the human beings, the extraterrestrials soon arrived by all over the planet, bring with them a lot of promises of progress and modernity. However, the relationship soon became oppressor and violent. Then, the antiextraterrestrial group Squadron 51 arrives, fighting the alien oppression in aircraft battles all around the world.
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