1978 and 1979 than in previous or subsequent years, and the claim does not withstand logical scrutiny: arcade operators would have emptied out their machines and taken the money to the bank, thus keeping the coins in circulation). Japanese arcade games during the golden age also had hardware unit sales at least in the tens of thousands, including Ms. Pac-Man with over 115,000 units, Donkey Kong with over 60,000, Galaxian with 40,000, Donkey Kong Jr. with 35,000, and Mr. Do! with 30,000. Other Japanese arcade games established new concepts that would become fundamentals in video games. Use of color graphics and individualized antagonists were considered "strong evolutionary concepts" among space ship games. The Namco's Galaxian in 1979 introduced multi-colored animated sprites. That same year saw the release of SNK's debut shoot 'em up Ozma Wars, notable for being the first action game to feature a supply of energy, resembling a life bar, a mechanic that has now become common in the majority of modern action games. It also featured vertically scrolling backgrounds and enemies. 1980s to early 2000s From 1980 to 1991, Nintendo produced a line of handheld electronic games called Game & Watch. Created by game designer Gunpei Yokoi, each Game & Watch features a single game to be played on an LCD screen. It was the earliest Nintendo product to gain major success. Mega Man, known as Rockman (ロックマン, Rokkuman) in Japan, is a Japanese science fiction video game franchise created by Capcom, starring a series of robot characters each known by the moniker "Mega Man". Mega Man, released for the Nintendo Entertainment System in 1987, was the first in a series that expanded to over 50 games on multiple systems. As of March 31, 2021, the game series has sold 36 million units worldwide.[1] Konami's Scramble, released in 1981, is a side-scrolling shooter with forced scrolling. It was the first scrolling shooter to offer multiple, distinct levels. Vertical scrolling shooters emerged around the same time. Namco's Xevious, released in 1982, is frequently cited as the first vertical scrolling shooter and, although it was in fact preceded by several other games of that type, it is considered one of the most influential. The first platform game to use scrolling graphics was Jump Bug (1981), a simple platform-shooter game developed by Alpha Denshi. The North American video game industry was devastated by the 1983 video game crash, but in