Super Mario Bros. Crossover

The iconic 8-bit platformer Super Mario Bros. is a frequent well to draw game mash-up inspiration from (exhibit a, exhibit b) but rarely is it revisited quite so thoroughly as here in this complete revisitation of the entire game as playable by a varied assortment of Mario's peers, other protagonists of hallowed NES franchises: Capcom's Mega Man, Konami's Simon Belmont from Castlevania, Bill R. from Contra and (since version 1.1) Ryu from Ninja Gaiden, also featuring Nintendo's own Samus (Metroid) and Link (Zelda)... plus Mario, naturally, the control case for this curious study.

SMB1 has been completely re-implemented (marginal cases like Minusland remain unexplored) while each alternate player retains their trademark controls, combat moves (buffed in increments depending on successful interception of mushrooms and fire flowers) and theme music. Between levels, players have the option of swapping the character being controlled.