Press the green flag twice until it says 'Player 1 - Select a color'. Select one of the 8 colors, and then let Player 2 select their color. Don't worry if you both pick the same color, the racing cars each say 'P1' or 'P2', indicating which player it is. Player 1: Use the A,W,S,D keys to move around. Reach the finish line before Player 2 to be crowned champion. You must only press 1 key at a time. Player 2: Use the arrow keys to move around. Reach the finish line before Player 1 to be crowned champion. You must only press 1 arrow key at a time.
Touching the outsides of the racing track too commonly lead to glitches and irregular movements of the cars.