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Gears of War 3 was ported to PS3 in order to test Unreal Engine 3

Yesterday, footage of a supposed PS3 build of Gears of War 3 was uploaded to YouTube. Turns out, it’s real.
The Gears of War franchise – which is exclusive to Microsoft’s Xbox and PC platforms – never saw a release on Sony’s last-gen system. But Gears of War 3 was ported to PlayStation 3 nonetheless with no intention of releasing it to the public.
In a statement, Epic Games clarified that the “footage is a byproduct of the company’s internal Unreal Engine 3 testing process.” (Epic Games is the creator of the Unreal Engine.) It “was never part of any actual product work for PlayStation 3,” the company added.
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So there you have it. Mystery solved. It’s an interesting nugget nonetheless!