Both sides of every phase feature a mechanism that allows the player to go off-screen to the left and appear on the right and vice versa. Each phase is a series of platforms with pipes at each corner of the screen, along with an object called a 'POW' block in the center. Unlike future Mario games, players cannot jump on enemies and squash them, unless they were already turned on their back. The objective of the game is to defeat all of the enemies in each phase. features two plumbers, Mario and Luigi, having to investigate the sewers of New York after strange creatures have been appearing down there. The original versions of Mario Bros.-the arcade version and the Family Computer/Nintendo Entertainment System (FC/NES) version-were received positively by critics. The gameplay focuses on Mario's extermination of them by flipping them on their backs and kicking them away. In the game, Mario is portrayed as an Italian-American plumber who, along with his younger brother Luigi, has to defeat creatures that have been coming from the sewers below New York City. has been re-released for the Wii's, Nintendo 3DS's, and Wii U's Virtual Console services in Japan, North America, Europe and Australia. It has been featured as a minigame in the Super Mario Advance series and numerous other games. is a platform game published and developed for arcades by Nintendo in 1983.

This game can be played also in a versions for Atari 7800, NES and DOS. If you think that the game in your browser doesn't work as it should, try to choose another online emulator from this table.

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