He is most notable as the developer of the Atari 2600's Adventure and as a founder of The Learning Company,[1] where he designed Rocky's Boots[2] and Robot Odyssey.

[4] While he was working on it, he had discovered and played Crowther and Woods' Colossal Cave Adventure at the Stanford Artificial Intelligence Laboratory, and decided that a graphical video game version "would be really cool".

[2] In response to this, Robinett placed a hidden object in the game that would allow the player to reach a hidden screen which displayed the words "Created by Warren Robinett," hence creating one of the earliest known Easter eggs in a video game, and the first to which the name "Easter egg" was applied.

[3] He founded The Learning Company[1] in 1980, and he worked on several educational games there, including Rocky's Boots and Robot Odyssey for the Apple II.

Robinett's Adventure Easter egg is a plot element in the 2011 novel and 2018 film Ready Player One.