the cartridge is called "GAME WIZARD" / "MAGISCHE SPIELE" and got released in 1990 by V-Tech/YENO. even the wikipedia-page shows "Game Wizard" was delayed for over a year and was eventually canceled."
i got it really cheap from ebay, also the german manual was included. which will get scanned in the next couple of days.
PCB/CARTRIDGE (FRONT & BACK):
some IN-GAME SHOTS:
with PROF. WEISS-ALLES:
as you can see, it fits perfectly in the current MESS driver! so it will get added soon.