1974 saw the release of Nishikado's Speed Race, an early black-and-white driving racing video game, which he considers to be his favourite among the games he had worked on prior to Space Invaders.
The game's most important innovation was its introduction of scrolling graphics, where the sprites moved along a vertical scrolling overhead track, with the course width becoming wider or narrower as the player's car moves up the road, while the player races against other rival cars, more of which appear as the score increases. The faster the player's car drives, the more the score increases.