Super Mario Bros. is a microgame featured in both WarioWare: Twisted! and WarioWare Gold. In the former, it serves as the boss stage for 9-Volt, while in the latter, it serves as the boss stage for 18-Volt.
This game utilizes the same gameplay from the original Super Mario Bros. The objective here is to reach the castle at the end of the level, while avoid enemies such as Goombas and Koopa Troopas. Items include the Super Mushroom, which will transform Mario into Super Mario. At the end of a level is the flagpole. The higher up you are when you touch it, the higher your score will be.
Unlike the original Super Mario Bros., there is only three levels in World 1, with World 1-3 serving as the castle level.