Easter egg

An Easter egg is a surprise deliberately hidden inside software, a video game, a film or a website — most often a joke, an animation, a secret mini-game or a wink to the user. The name echoes the tradition of hunting for hidden eggs: to uncover an Easter egg you usually have to perform an unusual, non-obvious sequence of actions, type a secret command or land on a special address.

How an Easter egg works

The first widely recognised Easter egg is credited to the 1979 Atari game Adventure, whose programmer hid his own name in an otherwise unreachable room — a quiet signature at a time when publishers did not credit developers. Since then, Easter eggs have become a cultural tradition in the tech industry. In practice they fall into a few types:

• In games — hidden levels, characters, nods to other titles or famous input codes like the Konami Code.
• In applications and systems — animations triggered by clicking a hidden spot, or secret information screens.
• On websites — reactions fired by a keyboard shortcut or a console command, built in JavaScript.
• In search engines — special effects that play when you type a specific phrase.

Easter eggs in practice

On a website, an Easter egg helps build rapport with the visitor: it surprises, entertains and reinforces the brand's image as creative and approachable. From a UX standpoint it is a detail that rewards curiosity, yet it must never interfere with core tasks or hurt performance. Well designed, it stays invisible to the average visitor on the frontend, and when discovered by a power user it becomes a delightful surprise worth sharing.