How to play

• Prop your phone or laptop upright at arm's length.
• Good lighting on your hands helps detection.
• Tap Start Challenge and allow camera access.

Show both open palms inside the dashed frame. When both hands are steady for a moment, a 3-second countdown starts.

Alternate your hands: one up, one down, then switch — over and over. Every full switch counts as one 67.

• Hands must be clearly separated vertically to count.
• Tiny wobbles are ignored (hysteresis + short cooldown).
• Ranks: Starter → Quick Hands → 67 Pro → 67 Legend.

• If the camera is blocked, use demo mode.
• Detection is on-device via MediaPipe — no video is uploaded.