Touchscreens are good for a lot of things. You can use one to swipe through news quickly and efficiently, paint a picture with your fingertips, and zoom in on a photo with a simple pinch. And as games like Monument Valley and Threes have shown, touchscreens can also be used to control some amazing games. But there's one thing that developers haven't been able to successfully pull off with a touchscreen just yet: a first-person shooter. It turns out that your fingers aren't the best control option for a fast-paced FPS.
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