Play online nintendo games directly in your browser. But now after more than 20 years, you can play the NES (Nintendo Entertainment System) absolutly free and What's next, maybe the Super NES will be like that? Mario Bros (). Super Mario Bros. is a platform video game developed by Nintendo in late and published for the Nintendo Entertainment System as a sequel to the. You are playing Super Mario Bros. 2 from the Nintendo NES games on play retro games where you can play for free in your browser with no download required.