Super Mario Bros. Crossover is a fan game that recreates the original Super Mario Bros. and allows you to play it as characters from other games.
Use Arrow Keys to navigate, and Z to make a selection or fight.
For optimal performance, play the game in the Firefox web browser. If the game does not load, upgrade to the latest version of Flash. If the game appears cropped and you cannot see the whole screen, zoom your browser out to the default setting and reload the page.