A round is one of two kinds, alternating. Letters: nine tiles are read out and you call the longest word you can build from them. Numbers: six numbers and a three-digit target, reached with plus, minus, times and divide. The passenger types what you say, and at the end the app shows the best word that rack held and the shortest route to that target, because it worked both out before it dealt them.

Players: Two or more people in the car.

Driver: Calls out words and arithmetic. Nothing to read.

The bar: The best word in the rack and the best way to the target, both found first.