Racetrack

Racetrack © 1976 Hewlett-Packard

Based on a pencil and paper game published in Martin Gardner's Mathematical Games column in Scientific American (May, 1973). Up to five contestants can input their acceleration (direction and magnitude) each turn while racing on an elliptical track. The calculator checks for collision with the track's bounds and updates the racers to the new position. It's up to the players to keep track of where everybody is.