You're human, you know comparison is the thief of joy, but it's your nature to compare. So please, compete with everyone around you! Now, click the circle. After starting the game, that is.

Ensure you're looking at the camera, you're in a well lit environment. Hold the device around 1.5 feet in front of your face and look in the camera. If that doesn't work, bring the device under you chin (~1 foot down) and look at the camera.