Figuring Out The Blue Prince Blueprints

Welcome to Mt Holly Estate. Here is a huge mansion with large open grounds and at least 45 rooms. The mansion is yours now; your late, great-uncle left it to you.

- Anusha Ganapathi (This economics graduate spends her leisure time preparing for the zombie apocalypse)

Oh, what's that? Do you need a place to stay tonight? Well, you can't stay at the house right now; you have to camp in a tiny tent on the grounds. Your great-uncle wants you to solve a little puzzle for him first, to prove that you are truly worthy of the mansion.

Don't worry, you've got this—we're all rooting for you! Old man Herbert Sinclair's request is simple. All he wants is for you to get to the 46th room in the house and unlock it. Unfortunately, the only way you can do so is by finding an elusive room called the "antechamber." I'll explain.