Super Duper Mario Bros.

Super Duper Mario Bros. is a pirate video game released for the PC Engine, Famicom, and Sega Megadrive in 1988. The developer and publisher was an unknown Japanese company known as Koshiro Co. Ltd. The PC Engine and Megadrive versions work fine; however the Famicom version is buggy and always crashes and freezes the Famicom, thanks to the dumbness of Koshiro. It was an epic fail at trying to make a direct port of the 16-bit versions to an 8-bit console.

The game is based on Super Mario Bros. and Super Mario Bros. 3. It uses a modified version of SMB's engine, but has graphics from SMB3 albeit enhanced. Music is taken directly from Altered Beast, oddly.

It has also frequently been sold in Russia, Hong Kong, and China.