Moriarty's Game: The Professor's Invitation - a real-world game by HiddenCity

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The Professor's Invitation

AN IMMERSIVE GAME ACROSS LONDON

A TREASURE HUNT ADVENTURE ACROSS LONDON - PLAY IN JANUARY TO WIN A SPA EXPERIENCE

THE EXPERIENCE

Face Sherlock Holmes’ arch-enemy. Professor James Moriarty invites you to celebrate the finest minds in London by solving his mysterious challenge, which he has personally prepared. Succeed, and he promises to make you an offer you can’t refuse...

Watch the trailer

PLAY IN JANUARY 2026 TO WIN A SPA EXPERIENCE FOR YOUR TEAM

The prize: A £420 gift card for Aire Ancient Baths London will be sent to the team captain selected in the draw.
How to enter: The top 5 teams for each game in January will be entered into a prize draw to win the prize. The entrant is the person who is registered as the ‘team captain’. Participants may enter up to four times: once per game, by completing each of the four games. Fastest time is determined by average time per clue.
How we’ll contact you if you win: Winners will be contacted via the team captain’s email address. The winner must claim their prize within 14 days by confirming the email address for receipt of their prize. If a winner does not claim the prize within 14 days, HiddenCity may select an alternative winner.
Terms, amendments and exclusions: HiddenCity may publish entrants’ names, team names and results. No other team details will be published. HiddenCity may make reasonable amendments to the competition if necessary. Prizes are non-transferable. Employees or the employees’ families of HiddenCity may not take part in the competition.

Book with confidence

Rain stops play? Your plans change? Fear not, your tickets are flexible.

Play guarantee - get a full refund if you cancel, for any reason

Free date changes - as many times as you need

Add players - you can buy tickets for more players later

What you get

Go on a thrilling real-world adventure from £19.00 per player. Book early for the best prices. Children under 10 go free with adults and do not require a ticket.

Your experience includes:

A 3-4 hour immersive experience across Marylebone, London

Interactive text messages and phone calls, for every ticketed player, with characters in the story

A prize for every ticketed player in successful teams, as well as your place on the leaderboard

Hands-on physical puzzles for your team to solve

A story that changes with the decisions you make

Interactions with people you meet, in the real world

Optional breaks in pubs and cafes, where you can pick up refreshments

Reviews

A pleasure to play ★★★★ The Stage

An invigorating and original London day out ★★★★ Culture Whisper

Perfect... A slam dunk Huw Fullerton, Radio Times

An awesome immersive experience Time Out

PLAN YOUR EXPERIENCE

Play at your convenience, with fully flexible tickets.

When can I play?

The game runs every day, including bank holidays. Start playing between 10.30am and 7.30pm Mon-Sat, and 10.30am - 5.30pm on Sundays.

How long is the game?

3-4 hours across 2 miles, including optional breaks of up to 75 minutes

Who can play?

Players of all ages are welcome. Under-10s go free. Under-18s can play if there is an adult in the team, and you complete the game by 6pm, due to licensing restrictions - so start your game by 3pm to give yourself plenty of time. This game is dog-friendly including indoor locations 🐾.

Start your game at:Marylebone High Street, London, W1U

How it works

Decipher clues, communicate with characters, solve physical puzzles, and make choices that affect your path in the story…

Watch how to play

Gather your friends into teams of 2-6 people.
Go to the start location and text "Begin".
Solve challenges, uncover hidden locations, and interact with people you meet and the world around you...

More about How it Works