Bring helmets from the machine that produces helmets to vehicles waiting on the side of the track, without needing any resources, and make them tour the track.
When you first start the game, you unlock the 1st level go-kart vehicle with the money to be given as base.
You have to provide the required number of helmets for this vehicle to tour the track.
You can upgrade these vehicles. As you upgrade, the speed of the vehicles, the number of rounds, the amount of helmet they want, the amount of money they earn per round increases.