Starship 1 (1976) Atari

Starship 1 Easter Egg

Sources:

Byrd, M. "Is This the World's Oldest Video Game Easter Egg?" Den of Geek, Jan 29, 2018. https://www.denofgeek.com/us/games/retro-games/263160/is-this-the-worlds-oldest-video-game-easter-egg

Machkovech, S. "The arcade world's first Easter egg discovered after fraught journey" Ars Technica, 22 Mar, 2017. https://arstechnica.com/gaming/2017/03/the-arcade-worlds-first-easter-egg-discovered-after-fraught-journey/

"This Was the World's First Video Game 'Easter Egg' " I'm A Useless Info Junkie. https://theuijunkie.com/gaming-first-easter-egg/