Yeah, that's kind of as I suspected...looks like this might just be an 'error' cartridge, especially since both Megamania and Pitfall! are Activision games.
Heh, imagine what a bummer that would be if someone purchased a cart like this retail expecting one game and getting another. In this case I don't mind at all since Pitfall! was one of my favorites as a child and the copy I ordered won't arrive until next week. So I get to play it early!!!
Thanks for the input...
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Otto