Videogame Easter eggs were popularized when programmer Warren Robinett responded to Atari's refusal to credit game developers by hiding the words ""Created by Warren Robinett" in Adventure. But even before that, text adventures included hidden commands and arcade cabinets hid secrets that could only be discovered by triggering certain input sequences.
These days Easter eggs are much more likely to be silly jokes or references than developer credits, but the tradition continues in everything from Diablo cow levels to the Ghost of Mount Gordo in GTA 5. What are your favorite videogame Easter eggs? Here are some of ours, add yours in the comments.