The 1985 Capcom game
Ghosts'n Goblins has been ported to MSX! The original game had been ported to many systems already, but an MSX port was never realized. In this platform game you control knight Arthur through the various stages to save his beloved who's been kidnapped by a messenger of Satan. The MSX port is more CPU-intensive than the original ZX-Spectrum version, the MSX port simply has more work to do. As a result of that, a 3.57MHz MSX will do, but with limitations. 7MHz comes highly recommended! On the bright side: the MSX version has been enhanced with a progress map, and there's music! (one tune for each stage!)
Relevant link:
Ghosts 'n Goblins