I had a quest in the last quarter of last year, to beat all the super grafx games i never beat since 1992 when i owned a SGX, and crushed GnG, and 1941.
I have beaten Battle Ace(f*cking hard), Granzort(even f*cking harder), and Aldynes(not too bad except the last boss, but there's a tutorial on the net on how to beat it.).
All games were ONLY possible for me, with Magic Engines save state feature, otherwise i would not have even attempted these games ever again as they are too impossible. I still have the save states for anyone wanting them i believe, and i saved the endings as well. GranZort's ending was lame, but the other two were decent.