Coordinate Royale

No devices, no network: one screen at the front and thirty students who are the game pieces. Everybody gets their own lattice point — never two on one, so “that’s me” is never a guess — and the coordinate called always belongs to somebody, so a round can never fizzle out on nobody. Run it from the keyboard: N deals the next round, space rules it stood up, M rules a miss, P pauses. Everyone moves between rounds, so nobody can memorise their spot. Running out of time costs nothing by default: it usually means a student was still working it out, and charging for that teaches them to stop trying rather than to think faster — a MISS is a ruling only you can make, so only you make it. Turn lives on in the studio and the same game becomes last-one-standing, with the number still in on screen beside the clock. The dials that move mid-lesson are on the screen itself: seconds per round, how wide the plane is, who turned out to be present. The rest — the default clock, the plane, what a point is worth, lives — is in the studio.