I can’t play augmented reality game. What can be the problem?

There are few rules that you have to follow when playing AR game.
1. Well and evenly lit room. Daylight or white artificial light is the best.
2. Always have clean lens on your camera.
3. Free area cca 1.5×1.5 meter.
4. Hard and flat flooring for reflecting ultrasonic signal.

About the author: dnb2017