Two Yellow Circles - Bottom left - compass

The screen for this puzzle has a compass needle with red and blue ends slowly rotating. When you lay the phone flat or hold it in the right orientation a white arrow appears that moves as you move the device.

Solution: To activate the puzzle you need to rotate the phone around in a circle keeping the white pointer over one end of the moving compass needle. The white pointer will turn yellow when it it in position correctly. You need to make a full rotation wirth each end to activate both yellow circles and complete the puzzle.

I have had a lot of trouble with this as it seems the compass sensor in my device is not well calibrated. It does not respond in a smooth way to movement. It can be done but on some devices it is very tricky.