In the current gaming climate, secrets in video games rarely stay secret for long.
From the moment of release, titles are scoured by determined YouTubers and completionists, all desperate to be the first to find every hidden treat, in pursuit of being the first to see something, or perhaps a retweet from the developer if they're exceptionally lucky.
However, in the days before social media, video game experiences were generally the personal business of the players. Nobody was so intent on discovering a game's secrets, that they would frequently go undiscovered for years or even decades, being stumbled upon by complete accident or even revealed a long way down the line by the studios themselves.
These impressively buried easter eggs can come in the form of hidden quests, entertaining in-jokes or even areas and pieces of code seemingly not intended from the finished product, but left in as a result of developers simply finding it easier to disable their access rather than remove them entirely.
It's not out of the question that this is still happening, and in 20 years time an ageing Rockstar programmer may well reveal through neo-Twitter that shooting exactly the right pebble with a small arrow by the Elysian Pool in Red Dead Redemption 2 will reveal Arthur's trusty steam-powered jetpack.
Until then though, the following are pretty damn cool.