The passenger reads out a short account of a day: stops, times, who was in the vehicle, what got spent. Exactly one sentence in it cannot be true, and you say which. The app wrote a true account, broke a single claim in it, and then checked that only that one sentence is to blame, so an argument about it is not possible. Par is a clock: one reading aloud, plus a re-read of the stretch holding the fault.

Players: Two or more people in the car.

Driver: Listens, then names the line that does not add up.

The bar: One reading aloud, plus a re-read of the stretch holding the fault.