Super Mario Bros. Crossover (Also known as Super Mario Crossover due to space limits) is a Flash game by Jay Pavlina. Basically, it's the original Super Mario Bros but with Bill Rizer, Samus Aran, Mega Man, Bass, Simon Belmont, Link, Ryu Hayabusa and Sophia the 3rd as additional playable characters (with many more characters available as skins), retaining the moves and physics of their source games. Being based on Super Mario Bros, all tropes present there apply here. Not to be confused with Mushroom Kingdom Fusion, which is a different game entirely.