Answer: Fairchild Channel F
We now expect Easter eggs (pieces of code hidden in applications by programmers and left as a surprise to users) to be quite innovative and sophisticated. Google, for example, often hides inside the Google logo Easter eggs containing full animations and games. In the early days of software and game design, there was not much room for elaborate Easter eggs.
The first known Easter egg in a video game console was found in a game for the Fairchild Channel F. The Fairchild Channel F was a second generation gaming console marketed by Fairchild Semiconductor in 1976. The Atari 2600 console is another console of the same generation. the Magnavox Odyssey and Mattel's Intellivision.
The Fairchild Channel F was unique in many ways. It was the first ROM-based programmable game console and the first game console to use a microprocessor. There was also a button "hold" on the console – the first appearance of a function similar to a pause on a video game console – users could press the hold button and freeze the action indefinitely to come back later. The blocking feature was not as developed or as useful as the game's save function, but it was unique at the time.
In addition to all this, the Fairchild Channel F can also boast the first known Easter egg in a console video game. The system included 2 built-in games, 26 cartridge-based games and 2 demonstration cartridges. Video Whizball, # 20, was a Pong-type game in which you bounced a ball on the ground and in the goal of your opponent. By playing a game sequence with the match set to a certain level with a certain score to finish, you can make the programmer's last name, Reid-Selth, appear in the middle of the field as an object of the game, your balls. (He also hid his daughter's name, Tracy, in the last five bytes of the software code).
Less interactive and on Democart # 1 for the system, there was an Easter egg on which would be written the name of the programmer – MICHAEL KT GLASS – if you held the buttons 1 + 3 + 4 and you release them at the same time, once the demonstration is over.
Since then, Easter eggs from video games have become increasingly sophisticated and range from subtle references to other video games to entire mini-games hidden in the host game.