This was in an era when videogame developers received little to no credit for their games. No names on the box, no credits at the end of the game, nothing. His hidden room easter egg was likely the only way he would be able to take any credit at all for his work.
That's exactly why those guys left Atari and started Activision. I remember reading the manuals to some of their early games and reading about the developers.
Jeremy Parish has a great video retrospective of Adventure, which goes more in-depth into its historical significance and influence. It also helps to see the game in motion: https://www.youtube.com/watch?v=TxDXie_2wck
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[ 4.9 ms ] story [ 26.1 ms ] threadhttps://atariage.com/manual_page.html?SystemID=2600&Software...
Nowadays except for a few indie games, developers are just cogs in the system and producers get all the fame.
http://benfry.com/distellamap/150dpi/advnture-illus-150dpi.p...
Indenture was also nice.