An Amstrad CPC game engine by Rhino (Batman Group) and a demo of a game by GinBlog82
-Super Mario Bros is the common point of the game engine that Rhino (Batman Group) is working on and about which Xyphoe did a video. In this case, Super Mario Bros world is only a proof of the game engine, not meaning an incoming game.
But GinBlog82 is really programming a Super Mario Bros game with hardware scrolling.
Youtube video