Casio Game and Watch Time
With their pedigree in making fine time pieces, it was natural for Casio to jump in on the whole games-on-watches craze in the early 1980s. These games were mainly a left-right (two button) affair, but boy, they were so cool to have (If you were lucky enough to have one). Remember, this was all before we started killing time playing games on our smartphones. Some things never change.