Based on a request this is Neutopia on the TurboGrafx-16 which is an adventure game in many ways similar to Zelda with perhaps a few more details and enhancements. In this video we begin the adventure in Neutopia and start exploring the land.
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Wow this game it's very similar to Zelda! The game I suggest you isn't really a Zelda style game but I think it's (maybe) the only game that could be defined an adventure game for 7800.
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It is similar indeed. I'll try to play the other game sometime. Thanks for watching :).