Final answer:
Super Mario Bros. is best described as an action adventure game, characterized by real-time gameplay, platforming elements, and a level-based progression.
Step-by-step explanation:
In Super Mario Bros., the gameplay revolves around navigating levels, jumping on platforms, avoiding obstacles, defeating enemies, and collecting items. The game genre that best describes Super Mario Bros. is action adventure. This genre is characterized by the real-time interaction and challenges, including hand-eye coordination and reaction-time skills that are necessary to progress through the game. Mario's quest to save Princess Toadstool and the inclusion of level-based progression further solidify it as an action-adventure title.