Mario Bros. is a 1983 platform game developed and published by Nintendo for arcades. It was designed by Shigeru Miyamoto and Gunpei Yokoi, Nintendo's chief engineer. Players control Italian twin brother plumbers Mario and Luigi as they exterminate turtle-like creatures, giant flies, and crabs emerging from the sewers of New York City by knocking them upside-down and kicking them away. The Famicom/NES version was the first game to be developed by Intelligent Systems. It is part of the Mario franchise and the first spin-off of the Donkey Kong series.
The arcade and Famicom/NES versions were received positively by critics. Elements introduced in Mario Bros., such as spinning bonus coins, turtles that can be flipped onto their backs, and Luigi, were carried over to Super Mario Bros. (1985) and became staples of the Mario series.