While there isn't a single official property titled "Mega-Adventure — Deep Text," your query likely refers to a few overlapping niche gaming or tabletop RPG (TTRPG) concepts:
: A notable indie horror text adventure for the Mega Drive. It is unique because the developer reportedly personalizes each physical copy, adding a layer of "deep" customization to the retro experience [1, 42]. 4. Google Search Easter Egg mega-adventure
: A Critical Role adventure noted for its deep supporting text and heavy world-building that allows players to explore every detail of the environment [2]. 3. Retro "Mega Drive" Text Adventures While there isn't a single official property titled