Adventure (Atari 2600 Video Game Cartridge)

Published by Sears
Developed by Atari
Programmed by Warren Robinette
Released in 1979
Via AtariAge
Play Adventure in your browser at 2600online.com

 

Adventure was a grounbreaking game that was one of the Atari 2600's most popular games.  Wikipedia says, "Adventure was published by the console's developer, Atari, Inc. It was inspired by a computer text game, Colossal Cave Adventure, created by Will Crowther and later modified by Don Woods.
Despite discouragement from his boss at Atari who said it could not be done, game designer Warren Robinett created a graphic game loosely based on the text game. Atari's Adventure went on to sell a million copies, making it the seventh best selling Atari 2600 game.
At the time of the game's creation Atari did not credit any of its authors for their work. Robinett included a hidden message in the game identifying himself as the creator, thus creating one of the earliest known Easter eggs in a video game. According to Warren, a young player from Salt Lake City, Utah first discovered the easter egg and wrote in to Atari regarding it."

Wikipedia has a pretty fleshed-out explanation of Adventure's gameplay, click here to read it.