I wanted to make a list of Easter Eggs, but first I had to land on a definition. After discussing it for a bit with my coworkers, we’ve arrived at the following conclusion: Easter eggs are secrets hidden within games that don’t have a significant change on the gameplay. Also, unlockable characters, even crossovers, are not Easter Eggs.
After much deliberation, I’ve come up with the following list of noteworthy Easter eggs in some of history's most memorable games. Please feel free to contribute your own ideas in the comment section because, frickin’ heck, dude, there are a lot of these strewn across gaming history.