General activity only, not medical measurement or treatment. Use a stable position and a comfortable hand height. Stop for pain, dizziness, breathlessness or unusual fatigue.
How to play
- Choose alternate, together or mixed cues and begin with a comfortable pace.
- Use touch or mouse, or enable optional local camera tracking for both hands.
- If using the camera, move both hands slowly during calibration without reaching your limit.
- When the left, right or both planets glow, move the matching hand or hands to the target.
- Keep following the visual cues. Gentle tones are optional and the game remains fully playable without sound.
Pace and comfort
Five settings change the actual beat interval: 1/8×, 1/4×, 1/2×, 1× and 2×. Start slowly and use a comfortable hand height. Touch users can tap left and right in sequence for a two-hand cue.
Privacy and safety
Camera processing stays in the browser; raw video and landmarks are not stored. This is a general activity, not medical assessment or treatment. Stop for pain, dizziness, breathlessness or unusual fatigue. Safety stop records zero score and reward.