The Witness is brutally difficult at times (read our review), but it is also fair. And now that it’s out on Xbox One, a lot more of you are going to learn about that. If you don’t understand something, it’s probably because you haven’t fully explored the island — or read our tips or full guide.

Off the coast of The Witness’s gorgeous island (through the back of the castle/hedge tower) is a shipwreck that contains a puzzle that is stumping a ton of people exactly because this mindbending adventure contains so many different ideas and rulesets. Well, if you want the answer now, we’ve figured it out. And we’re going to share it with you.

The Witness is the latest game from renowned indie designer Jonathan Blow, who came to fame after kicking off an era of great independently developed games — and an entire new market — with his time-traveling platformer Braid in 2008. Since then, Blow and his studio Thekla, have worked on building The Witness, which it released January 26.

The video below gives a full explanation of how to solve the red door puzzle inside the ship. If you’re worried about spoilers, this video has them — but it also builds up to them slowly. So you’ll have about a minute to decide if you’ve gotten enough inspiration to solve the thing yourself without waiting for me to give you the answer.

So, are you ready to learn?