"This," Halliday says, pointing to the screen with genuine reverence, "was the very first videogame Easter egg. Robinett hid it in his game’s code without telling a soul, and Atari manufactured and shipped Adventure all over the world without knowing about the secret room. They didn’t find out about the Easter egg’s existence until a few months later, when kids all over the world began to discover it. I was one of those kids, and finding Robinett’s Easter egg for the first time was one of the coolest videogaming experiences of my life."