Play Sonic Bros online in your browser and enjoy with GamesFrog! Sonic Bros is NES game USA region version that you can play free on our site. This game has nintendo, mario, sonic, arcade, platform, retro, emulator tags for Nintendo console. If you love Nintendo Mario Sonic Arcade Platform Retro Emulator games you can also find other games on our site with GamesFrog. Below you will find control for the emulator to play Sonic Bros.