For awhile now, hacks on classic games have been really popular. Some are downright genius, whereas others are for laughs. Super Mario Bros. Crossover is the latest project by Jay Pavlina, founder of a production company called Exploding Rabbit, and easily falls into the aforementioned genius category.
Taking characters from Metroid, Castlevania, Contra, Mega Man, Ninja Gaiden, Legend of Zelda, and obviously Mario, Pavlina has created an incredibly fun flash game that anybody can play as long as they have a computer and an internet connection.
Meant as a tribute to the classics, Super Mario Bros. Crossover is surprisingly fun, and really makes you wish somebody released something like this as a download for the current generation of consoles.