The Hardest Room in the Building: Tesla's Mystery Reviewed

There's a letter from your old friend Nikola Tesla. In it he confesses he's built a working teleportation device — and he's terrified the blueprints will fall into the wrong hands, so he's hidden them in his New Yorker hotel room behind a gauntlet of puzzles only you could crack. The catch: the FBI is already sniffing around, desperate to seize the invention. You've got 60 minutes. Welcome to Tesla's Mystery, the room Fox in a Box hands to anyone who claims escape rooms are getting too easy.

This is the hardest room in the venue and it doesn't pretend otherwise. The design is aggressively non-linear — the kind where logic and lateral thinking matter more than spotting the next padlock, and where a wrong assumption can cost you ten minutes you don't have. There's no hand-holding here; clues connect in ways that genuinely make you think sideways, and the set is wired with enough electrical flourish to keep the mad-scientist fantasy crackling while your brain works overtime.

I'd actively steer first-timers away — not because it's unfair (Fox's puzzles are always logical, and a Game Master nudges you on-screen when you stall) but because the satisfaction here is calibrated for people who've cleared a few rooms and want to be properly humbled. Rated 12 and up, it's the room for the friend who insists nothing can stump them. Book it, point them at the blueprints, and watch the confidence drain out of the room around the 40-minute mark.

The Verdict

Tesla's Mystery is the boss level — Fox in a Box's toughest, brainiest hour, and the one I'd save until you've earned it. Clear it and you'll be insufferable for a week; that's the deal. We found the blueprints with the FBI (figuratively) at the door and the kind of group euphoria that only comes from beating something that was genuinely trying to beat you.

Want to build up to it? Here's the full Fox in a Box review and where every room sits. When your team thinks it's ready, take on Tesla's Mystery — and find out whether "we're good at escape rooms" survives contact with the best mind in the building.