Hold the phone! Ryu Hayabusa from the NES classic Ninja Gaiden has just been added to the already fantastic Super Mario Bros. Crossover game by Exploding Rabbit studios. The fine artists at Dueling Analogs just recently came up with the mock NES cover you see above, fantastic work to be sure, I especially dig the Internet approved seal on the bottom right corner.
Jay Pavlina, the creator of the Super Mario Bros. Crossover flash game says that Ryu will make his debut with the 1.1 upcoming update. I cannot wait to take on Bowser with Ninja skills!