This version was released by Konami and was a side-scrolling beat em up considered one of the better brawlers of its era and one of the best Batman games.
Now homebrew devs Pyron (graphics), TiagoSC (code), InglebardMusic and vectororbitex7866 (both music) are bringing that classic game to the Sega Genesis / Mega Drive. This version will be vastly improved, coming with a two player mode, as well as a higher resolution, 60fps and more enemies on-screen at once.
This fan port will be released on Christmas Day, so get ready for a fun holiday.