Moriarty’s Game: The Professor’s Invitation by HiddenCity

Moriarty’s Game turns Marylebone and Mayfair into a giant outdoor puzzle. Instead of following a guide holding up an umbrella, you receive clues on your phone, search for locations, solve riddles, and help move the story forward at your own pace. The route takes you through side streets and corners of London that a standard sightseeing walk can easily miss.

I like the freedom to pause for food or drinks and the fact that the puzzles are designed for teams of two to six. I also like that the challenge is engaging without being punishing. The main catch is practical: you need a UK, US, or Canadian mobile number, and a group that dislikes phone-based games may find the format less appealing.

Key points to know before you book

• A 3 to 4 hour trail: Plan most of an afternoon, with the option to stop at built-in break points.
• Marylebone to Mayfair: Start at 93 Marylebone High Street and finish in Mayfair.
• Phone-led storytelling: Clues, riddles, and puzzles arrive on your mobile phone.
• Small-team format: Play with 2 to 6 people, or split a larger party into teams for a head-to-head contest.
• Real London streets: The route includes less familiar West End corners and unusual locations.
• Flexible private experience: Only your group takes part, and you can pause whenever you need to.

Starting at 93 Marylebone High Street

The game begins at 93 Marylebone High Street, a central meeting point with access to public transportation. From there, you set off as a private group rather than joining a larger walking tour. That matters if you want to keep your own rhythm, talk freely, or let children and friends share the puzzle-solving.

You do not need to be at the start with a guide for a formal briefing. The experience is built around clues sent to your phone, so your group takes responsibility for reading each prompt, working out the answer, and deciding where to go next. I find this format best for people who enjoy a little independence. You are not simply being led from one sight to another. You have to pay attention and make choices.

The story gives the route a purpose. Instead of strolling through Marylebone with a list of unrelated buildings, you are looking for clues connected to Professor Moriarty. The literary theme adds a playful reason to inspect streets, buildings, and details that might otherwise pass unnoticed.

A phone with a UK, US, or Canadian number is required. Check this before booking, especially if you are visiting from elsewhere and plan to rely on a travel SIM or a phone number from another country. The supplied information does not promise that other numbers will work.

Marylebone, with a puzzle in your pocket

Marylebone is a good setting for this sort of activity because it rewards slower walking. The route takes you through streets and locations beyond the standard guidebook circuit, giving you a reason to notice small details rather than rushing toward a famous landmark.

The experience does not list every stop in advance, which is part of the fun. You uncover locations as the clues arrive. Expect the route to combine ordinary city walking with moments when your group must stop, read carefully, inspect its surroundings, and agree on an answer.

This is not a history lecture. If you want dates, architectural commentary, and a guide explaining every façade, book a conventional walking tour instead. Here, the city is the playing board. The story and puzzles take priority.

That difference can be a strength for families and friend groups. Younger participants get a clear job to do, and adults can help without needing specialist knowledge of Sherlock Holmes. The puzzles are described as interesting but not too difficult, so you should get a sense of progress rather than spend the whole afternoon stuck at one clue.

Still, group chemistry matters. One person may want to race ahead while another wants to read every instruction twice. Since the activity runs privately, your team can settle its own pace, but you will need to cooperate. For a larger party, splitting into several teams and playing head to head adds a competitive edge.

Moving from Marylebone toward Mayfair

The route continues across London toward Mayfair, with the full experience taking about three hours and often stretching to three or four hours. The extra time is not just walking time. You are solving problems, checking clues, discussing possibilities, and stopping when you want a break.

This makes the game feel less rigid than a normal tour. You are not tied to a guide’s timetable or a fixed departure every few minutes. If your group needs coffee, lunch, or a short rest, you can pause at one of the selected break points. Refreshments are not included, so budget separately for anything you buy.

The stop between Marylebone and Mayfair is valuable because it helps the experience feel like a London outing rather than a long quiz. You can break up the puzzle work, look around, and continue when everyone is ready. I would still wear comfortable shoes and avoid scheduling a tight theatre booking immediately afterward. The stated duration is approximate, and a group that pauses often will need more time.

Mayfair provides a fitting finish for a West End route. The end point is listed as Mayfair, London, rather than a specific attraction or venue. That gives the activity a clear neighborhood finish but means you should check the final location details before making onward plans.

How the phone clues shape the experience

The phone is central to the game, not a minor extra. Clues are sent to your device, and your team uses them to uncover places, unravel riddles, and solve puzzles. You will want your phone available throughout the activity and enough battery for several hours of use.

The digital format keeps the experience private and self-directed. You can read a clue together, let one person handle the phone, or pass it around as the story develops. In a larger group, decide early who is responsible for the device so you do not lose time sorting out the next instruction.

There is also a useful balance between screen time and street time. You look at the phone to understand the task, then put it away while searching the real city for the answer. That makes this more active than a seated escape room, but less formal than a guided tour.

The downside is that the quality of your afternoon depends partly on how well your group handles the technology. A weak signal, low battery, or confusion over the instructions could slow you down. The available details do not specify whether hints or technical support are provided, so do not assume that every problem will be solved instantly.

What makes the lesser-known stops worthwhile

One of the strongest reasons to choose Moriarty’s Game is its route. The activity promises West End locations that are not found in every guidebook, along with small streets and out-of-the-way places along the way.

That does not mean every stop is a major monument. In fact, the pleasure comes from seeing how a puzzle can make an ordinary corner feel important. You may pass through a street you would normally ignore, then look again because the clue tells you to search for a particular detail.

This approach suits repeat visitors to London especially well. If you have already seen the major sights, a game gives you a fresh reason to explore central neighborhoods. First-time visitors can also enjoy it, though I would not use it as your only introduction to London. The activity does not replace a broad overview of the city’s history or its main landmarks.

The literary theme helps tie these places together. Moriarty gives the route a sense of intrigue without requiring you to know every detail of the Sherlock Holmes stories. If you already enjoy detective fiction, the tone should feel natural. If you do not, the puzzles still provide the main structure.

Choosing your team size

The experience is intended for teams of two to six players. Two people can make quick decisions and keep the game moving, while four to six gives you more eyes for spotting details and more ideas for solving riddles.

A very small team has one clear advantage: nobody can disappear into the crowd or leave all the work to someone else. You also make fewer decisions about where to go next. The tradeoff is that two people must handle every clue themselves.

With six players, the activity becomes more social. You can divide tasks, with one person reading the prompt, others checking the surroundings, and someone keeping the group pointed in the right direction. The risk is that a large group may move more slowly or talk over one another.

If your party is larger than six, the suggested approach is to create multiple teams and play head to head. That is a smart way to turn the afternoon into a friendly contest. Set clear rules before starting, since the provided details do not explain how scoring or winning is handled.

Families can enjoy the format because the game offers a shared goal. It also works for friends who want more structure than simply wandering around. Couples and small groups should be ready to discuss every clue rather than expecting one person to lead the whole way.

Price and value at $40.90 per person

At $40.90 per person, this is not the cheapest way to walk around Marylebone. There is no admission ticket to a major attraction included, and refreshments cost extra. You are paying for the story, the route design, the digital clues, and the private group format.

The value improves when you compare it with what the activity replaces. A private three-hour experience for a small group can cost more once you add a personal guide, while this option lets you explore independently and keep your own pace. For a group of friends, the shared game may also be more memorable than another standard sightseeing walk.

It is less compelling if you simply want to see famous London sights as efficiently as possible. The route is designed around puzzles and lesser-known locations, not a checklist of major monuments. You should book it for the activity itself, not as a low-cost way to cover the West End.

The ability to pause adds real value. You can stop for a drink, discuss a difficult clue, or take a break without abandoning the experience. Since the game is private, you are not holding up a bus or a guide, though you should still keep an eye on the clock if you have evening plans.

Timing, access, and practical planning

The available operating schedule is Monday through Saturday, from 10:30 a.m. to 6:30 p.m., for the listed period from February 18, 2022, through January 21, 2027. Confirm the date and start time you select when booking, since the operating information is tied to that stated schedule.

The meeting point is near public transportation, which makes the start convenient for a central London outing. The ending point is in Mayfair, so you can continue exploring that area afterward or arrange onward transport from there.

Most people can take part, and service animals are allowed. The experience is private, so only your group participates. No special fitness requirement is stated, but the activity involves moving through city streets for several hours. Comfortable footwear is a sensible choice.

Bring a charged phone and make sure the required phone number is available. Keep some room in your schedule for breaks and the possibility that your group solves clues at a slower pace than expected.

Free cancellation is available if you cancel at least 24 hours before the start time. Cancellations made less than 24 hours ahead are not refunded, and changes inside that period are not accepted. Cutoff times use London local time, so check the clock carefully if you are booking from another time zone.

Who should book Moriarty’s Game

I would recommend this for families with older children, couples who like riddles, and friends looking for a shared challenge in central London. It is also a good pick for repeat visitors who want to see Marylebone and Mayfair from a different angle.

The format works particularly well if your group likes to make its own decisions. You can pause, debate, take breaks, and set your own speed. The game is engaging without being too hard, which makes it accessible to people with different puzzle-solving abilities.

I would think twice if your priority is expert commentary, major attractions, or a tightly timed itinerary. You should also reconsider if your group lacks a UK, US, or Canadian mobile number, since that requirement is essential to taking part.

Should you book it?

Book Moriarty’s Game if you want a private London puzzle walk rather than a standard guided tour. The Marylebone start, Mayfair finish, unusual West End locations, and flexible pauses give you a solid three-hour city outing with a clear theme.

Skip it if you want a traditional history walk or a simple route from one famous sight to the next. For the right group, though, $40.90 buys more than directions on a map. It gives you a reason to explore, cooperate, and pay attention to the streets between London’s headline attractions.

FAQ

Where does Moriarty’s Game start?

The experience starts at 93 Marylebone High Street, London W1U 4RD, UK.

Where does the experience finish?

The game finishes in Mayfair, London.

How long does Moriarty’s Game take?

The experience lasts approximately 3 to 4 hours. The itinerary also gives a three-hour duration.

How many people can play together?

Teams should contain 2 to 6 players. Larger groups can split into multiple teams and play head to head.

Do I need a mobile phone number?

Yes. A UK, US, or Canadian mobile phone number is required to take part.

Are food and drinks included?

No. You can pause at selected break points for refreshments, but food and drinks are at your own expense.

Is this a shared tour?

No. This is a private activity, so only your group participates.

Can I cancel for a refund?

Yes, if you cancel at least 24 hours before the start time. Cancellations made less than 24 hours before the experience are not refunded.