Using a handheld system, and a customized movement sensor, gamers enter a virtual entire world infested with pixel-artwork zombies (a homage to classic 8-bit console games). A more innovative unit, centered on a bicycle pump, was formulated by Geddings Osbon, a Pentecostal preacher, in the seventies. In 1982, he gained Fda approval to industry the item as the ErecAid®.