This is a general recreational activity, not a medical assessment or treatment. Use a stable position and stop for discomfort.
How to play
Choose a wave, circle or figure-eight path. With camera mode, first move your selected hand slowly through a comfortable area for calibration. Then follow the glowing target to wipe the frosted window. Touch, mouse and arrow keys are available without a camera.
Comfort and safety
Start seated or well supported at 1/8×, 1/4× or 1/2×. Speed changes the target's actual movement. Keep the device stable, do not reach to your limit, and stop for pain, dizziness, breathlessness or unusual fatigue. Camera images are processed in the browser and are not saved by the game.
This recreational activity is not a medical measurement, assessment, diagnosis or treatment.