I felt my pulse quicken. I’d uncovered something here. Some sort of Easter egg, hidden inside this old coin-op videogame. It wasn’t the Easter egg. Just an Easter egg. Some sort of challenge or puzzle, one I was almost certain had been created and placed here by Halliday. I didn’t know if it had anything to do with the Jade Key. It might not be related to the egg at all. But there was only one way to find out.