It's a remake of the NES game Super Mario Bros where you can choose other characters from other classic NES games to play the game. Instead of playing the game as Mario, you can choose other characters from Contra,Castlevania,Mega Man, Metroid, Zelda, and Ninja Gaiden. Each character features their weapons,attacks, and their own music.

http://supermariobroscrossover.com/

Yep, I've played that game - it's lots of fun! I've already completed it on every difficulty, including 'Extreme' mode. Definitely the BEST remake of the original SMB!

Yeah it's pretty fun. I think my favorite character to use it Simon Belmont. I like throwing the axes, the fire whip, and his double jump.

Here's a video of the creator of the remake playing his own game. I think it's pretty funny. Kinda reminds me of Angry Video Game Nerd.

http://www.youtube.com/watch?v=ZGIIkDkJP3U&feature=related

I even downloaded it and used Xpadder to setup the controls so that I can use the Xbox 360 Controller for Windows. Oh and btw. I finished it, and yes, I agree that this is the best remake of SMB.

Once Abobo's Big Adventure comes out, it'll not only overshadow Super Mario Crossover, but it will bite its head off and chomp on it too.

Yeah, I have. I'm not really a fan of flash games using NES characters, but I loved this game. It was a very unique twist to the original SMB by adding other characters that you know from the classic NES era.

Juuussst don't play as Simon Belmont. He can get stuck between blocks and then you would be totally screwed.