Game Description. Put your slot car on the tracks and push the pedal to the metal in Slot Car Gran Prix, a fast and furious FREE racing game. Race with slot cars on this version of the popular 80's and 90's game! Remember your childhood or show your sons how you used to play! Accelerate or brake. Slot Car Challenge - Free Game Play. Play free online game Slot Car Challenge. Play full version mobile game Slot Car Challenge without any limitations!.