After several weeks, he got permission to scrap the existing code and begin from scratch. Only Rick Levine's basic concept and graphics were kept, with new animations by Joe Ferreira . Rick Koenig approached the game scientifically, writing routines to simulate all the movements of the cycles according to the laws of physics. The result is motorcycles that accelerate, skid and jump realistically. The Sports Network isn't mentioned on Motocross 's final packaging.
Gravity is a factor in the motion routines.
During testing, Rick made gravity adjustable to determine the best looking arc when jumping. Several unsuspecting programmers were invited to test the game, not knowing gravity had been set to zero.