This is one of the greatest things ever in videogames, straight out of an 80s childhood dream. Super Mario Bros. Crossover, a game in which you play the original Super Mario Bros. as other NES videogame characters, who control exactly as they do in their own respective games. Beyond awesome. The background music and powerups also change accordingly. You can play this right from your browser at Newgrounds. I’m hoping someone finds a way to adapt this for emulators, so I can own an actual copy on my mac, because this is just way too awesome.