This story contains minor spoilers for Jedi: Fallen Order.
The newly released Jedi: Fallen Order contains an Order 66 easter egg so well hidden, it was found only by the most curious and exploratory of gamers. Easter eggs are a fun way for game developers to give a nod to something they love, hint at a larger universe, or reward the player for their devotion to a series.
For those who don't know, Order 66 was originally from a line uttered by Darth Sidious, better known as Lord Palpatine, in the third Star Wars prequel film Revenge of the Sith. The purpose of the order was to declare all Jedi as traitors of the Galactic Republic, and was implemented via control chips implanted into the Grand Army clone troopers' brains that forced them to turn on the Jedi. In short, it was the beginning of the Sith's plans to bring down the Jedi Order.
Jedi: Fallen Order takes place five years after Episode III, so the effects of the order have mostly played out in full. According to VG24/7 the player character Cal finds himself on a train on the junkyard planet Bracca early on in the game's story, and as he follows his friend Prauf through a door, it naturally shuts behind him. The average gamer would simply move forward with the story rather than turn around and spend approximately two minutes pressing the button on the door, but that's exactly what Youtuber Garbett did, 66 times to be exact. Once this is complete, the player will hear Palpatine deliver one of the most famous lines in the Star Wars canon: "Execute Order 66." It even pops up in the subtitles, confirming it's really an Easter egg for the player to find.
This isn't the first time we've seen an Order 66 Easter egg. References are sprinkled throughout the Battlefront games, as well as in various Star Wars novels and comics. It is also mentioned in Star Wars Jedi: Fallen Order a few other times during some of the flashback sequences, and it's not hard to imagine why—the effects of Order 66 set off a chain reaction that affected the entire galaxy, and it's easily one of the most momentous events in the Star Wars lore.
As for how Garbett even thought to try pressing this particular button that many times is hard to say, but his dedication is pretty admirable regardless. His YouTube channel is devoted mostly to finding Easter eggs or hidden endings to games, so if anyone was going to find it, it makes sense for it to be him.
Star Wars Jedi: Fallen Order is available now on PC, PlayStation 4, and Xbox One.