HBO's sci-fi series Westworld has become known for its various Easter eggs, secrets, and hidden details, so it's only fitting that the series has another secret. According to Entertainment Weekly, each of the Westworld seasons actually has a special, subtitle-ish code name.

Instead of merely calling them "Season 1" or "Season 2," the showrunners Jonathan Nolan and Lisa Joy actually think of Westworld's first two 10-episode arcs as them "The Maze" and "The Door," respectively.

"If the first season was a journey inward, this is a journey outward,” Nolan said. “This is a search for what is else is beyond the park, and what else is in the park. Are there more parks? How big is the park? What’s beyond the park? We think of our seasons as discrete components in the series, to the point where we’ve named our seasons."

This small piece of information could provide some secrets on what to expect in the upcoming episodes, but if Season 1 (sorry, "The Maze") is any indication, knowing what to expect (or thinking you do) doesn't mean you'll be able to catch all the things hidden in each episode. Just ask star Evan Rachel Wood

"The Maze" seems like a fair title for the first season. It's a symbol used throughout the virtual theme park and a metaphor used by park creator Arnold to create true consciousness within the hosts. If the first title is any hint, "The Door" could also be a literal or metaphorical symbol of the upcoming season. One thing is for sure: we're entering whole new themed areas, and it's definitely going to be confusing as hell. 

Westworld premieres on HBO Sunday, April 22. Hopefully it has some more surprise Kanye West cover songs mixed throughout as well.