Micro Machines

Micro Machines is a well-known line of less-than-an-inch-size toy cars by Galoob. The toy line even has video games based on it, of which are also programmed by Codemasters, of whom were on contract with Galoob

Game genie codes
Interestingly, the Game Genie itself was produced by Galoob and its on-contract programmer Codemasters.