• ✓Idea: two hands doing two jobs at once — the same skill as buttons or scissors
• ✓Harder levels swap the sides, so an arm must cross the middle of the body
• ✓Real multi-touch — a tablet reads two live fingers
• ✓On a desktop, one key under each hand — still two hands
• ✓Never timed — four seconds to organise two hands is doing it right
• ✓13,000 pairs checked — no pair one hand could cover
• ✓Camera mode: the spots float over the live room and real hands reach out and cover them
• ✓No 8MB hand model: it learns the room and watches what covers a spot (lib/hand-cam.ts), so an old phone plays too
• ✓No frame is recorded and none leaves the device
• ✓422 synthetic frames check the eye: a hand arriving, resting, leaving, and the lights changing (npm run verify:handcam)
• ✓Let the spots be placed to a particular child's reach — today they sit where the finger version puts themplanned

✓ = done · ☐ = planned. Every game is built one step at a time like this.