Reyn Guyer of St. Paul, Minnesota, had originally entered the game design world in the 1960s when he and some fellow colleagues working at his father’s design firm created what would become Twister. The next major breakthrough came with the NERF ball, which was produced by Parker Brothers in 1970. Marketed as the world’s first indoor ball, the NERF idea came while working on another game idea that involved cavemen and money hidden under foam rocks. During one of the breaks he noticed one of the players tossing a foam rock into a hoop. Parker Brothers introduced a simple four-inch foam ball and had sold 4 million by the end of the first year. Since that time, the NERF brand has greatly expanded to include a basketball game with a hoop, a NERF football invented by Fred Cox in 1972, a kicker for the Minnesota Vikings, and more recently NERF pellets fired by a blaster gun.