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

Moriarty’s Game turns a walk from Marylebone to Mayfair into a phone-led hunt for clues, puzzles, and secret corners. You follow the story at your own speed rather than trail a guide with an umbrella, which gives the experience a more private, flexible feel.

I like the chance to see small West End streets that do not usually appear in guidebooks, and I like that the puzzles are designed for teams rather than solo puzzle experts. The main thing to consider is the three to four hour length: this is a walking game with mental work, not a quick attraction you squeeze between two museum visits.

Key points at a glance

• Start on Marylebone High Street: Meet at 93 Marylebone High Street, then follow the trail toward Mayfair.
• Play by phone: Clues arrive on your mobile, so a UK, US, or Canadian phone number is required.
• Teams stay small: Play with 2 to 6 people, or split a larger group into teams for a head-to-head contest.
• The route leaves the guidebook behind: Expect lesser-known streets and locations across the West End.
• Built-in pauses help: Stop for food and drinks along the way, but pay for refreshments yourself.
• Flexible timing matters: You can pause the game whenever you need to, useful for families and mixed-pace groups.

What Moriarty’s invitation actually gives you

This is a self-guided mystery game set across central London. You receive a trail of clues on your phone and use them to move from one point to the next, solving riddles and puzzles as the story develops.

The setup gives you a role in the plot. You are not simply looking at buildings while someone recites dates. You are trying to work out what each clue means, then deciding where to go next. That small change makes familiar central London feel more active.

The experience begins in Marylebone and finishes in Mayfair. Both areas are easy to reach by public transport, and the route keeps you in the West End rather than sending you out to a distant part of the city. The exact secret locations are part of the game, so you should not expect a full route map before playing.

I like this format for a group that wants sightseeing with a purpose. You get the pleasure of wandering, but the clues give the walk direction. If your group prefers a traditional guide, a fixed schedule, or a detailed explanation at every stop, this may feel less satisfying.

Starting at 93 Marylebone High Street

Your starting point is 93 Marylebone High Street, London W1U 4RD. The opening area is useful for getting everyone together before the puzzle begins. Marylebone has a more relaxed feel than some of central London’s major shopping streets, so it is a pleasant place to begin a long walk.

The game is offered Monday through Saturday from 10:30 in the morning to 6:30 in the evening during the stated operating period. Since the experience takes around three to four hours, check that your chosen start time leaves enough room before closing.

You play in teams of 2 to 6 people. That is a good size for discussion. Two people can make every decision together, while a group of six can divide jobs between reading, searching, and solving. Larger parties should split into several teams and play against one another.

That head-to-head option changes the mood. One team may race ahead while another takes more time with the story. It works well for families, birthday groups, and friends who enjoy a little competition, though you should decide in advance if your group wants to compete or simply solve the case together.

Following clues through Marylebone and the West End

The first part takes you through Marylebone and onward across the West End. The route is built around clues delivered to your phone, so your attention moves between the screen and the streets around you.

This is where the experience earns its price. A normal walk through Marylebone might take you past attractive buildings and side streets without giving you much reason to stop. Here, the puzzle asks you to look closer. A doorway, sign, corner, or other street detail may become part of the next question.

The supplied details do not identify every stop, so you should treat the route as a surprise rather than a checklist of named landmarks. That is a strength if you enjoy discovery. It is less useful if you want to know in advance exactly which famous sights you will see.

The game is described as literary in theme, with Moriarty and the professor’s invitation providing the story frame. You do not need to approach it as a serious Sherlock Holmes study course. Think of it as a playful mystery with a bookish flavor, suited to people who like riddles, fictional plots, and city walks.

The puzzles are meant to be interesting without being too punishing. That balance matters in a mixed group. A game that is too easy can feel like a list of instructions, while a game that is too hard can leave one person doing all the work. This one aims for shared problem-solving.

Secret locations instead of a standard sightseeing route

One of the strongest reasons to book this activity is the route’s focus on places not normally found in guidebooks. You still move through well-known central London districts, but the game directs your attention toward smaller streets and less obvious corners.

I value that kind of sightseeing because it gives you a better sense of how the city fits together. You are not only going from one major monument to another. You are crossing neighborhoods, noticing the changes in the streets, and seeing parts of Marylebone and Mayfair that you might otherwise pass without a second look.

There is a trade-off. The experience does not promise a full history lesson at each location, and the information supplied does not name the hidden stops. You should book it for the combination of walking and mystery, not as a replacement for a detailed architectural tour.

The final area is Mayfair. Reaching Mayfair gives the activity a clear finish after your journey across the West End. The exact endpoint is listed as Mayfair rather than a named attraction, so plan your onward route once you have finished the game.

Pauses for coffee, food, and a reset

You can pause the activity at built-in break points for food and drinks. Refreshments are not included in the price, so bring a payment method and budget for your own stops.

This is a practical feature, especially because the game lasts about three to four hours. A short break can keep younger players involved and gives adults a chance to sit down before tackling the next puzzle. It also means you do not need to treat the whole experience as one uninterrupted push.

The flexibility is useful for groups with different energy levels. You can stop when someone needs a rest, then continue when the group is ready. That makes this easier to manage than a tightly timed walking tour.

The downside is that pauses can stretch the total outing. If you have dinner reservations, a theatre booking, or another timed activity, leave a generous gap. The stated duration is approximate, and your team’s solving speed and break choices will affect the finish time.

How the phone format changes the experience

Your phone is the main tool for the game. It delivers the clues and helps move the story from one location to the next. A UK, US, or Canadian mobile number is required, so this is an important point to check before paying.

For international visitors with another type of number, the supplied information does not confirm eligibility. Do not assume that a data connection alone solves the issue. Check the phone-number requirement with HiddenCity before booking if your number is outside the accepted countries.

The phone-based system keeps the activity private. Only your group takes part, rather than joining a larger public party. That lets you discuss answers freely and set your own rhythm.

It also places more responsibility on your group. There is no guide beside you to explain a confusing clue on the spot. If your team gets stuck, you will need to work through the puzzle together and follow the instructions on the phone.

Is the three to four hour length good value?

The listed price is $40.90 per person. That is more than you would pay for a simple self-guided walk, but the cost covers a structured story, a sequence of clues, puzzle design, and a private group experience lasting several hours.

For a team of friends or family members who would otherwise pay for several separate attractions, the value can be reasonable. You get an activity and a city walk at the same time. The route also gives you a reason to explore streets you may not have chosen on your own.

The value is weaker if you dislike puzzles or would rather spend the same money on a museum, a food tour, or a conventional guided walk. Refreshments cost extra, and the experience does not include a guide, transport, or admission to another attraction.

A 4.8 rating from 445 ratings, with 95 percent recommending it, suggests that the format works well for its intended audience. I would read those numbers as a sign of consistent enjoyment, not as a promise that every group will love a phone-based mystery.

The best value comes when you take your time. Racing from start to finish may turn the game into a competition and reduce the pleasure of the streets along the way. If you pause for a drink, discuss the clues, and notice the route, the price feels easier to justify.

Who will enjoy Moriarty’s Game most

This activity suits families with older children, couples, and groups of friends who like shared puzzles. It is also a good choice for people who have already seen London’s major sights and want a different way to spend an afternoon in the West End.

You should be comfortable walking through city streets for several hours and using a mobile phone as part of the activity. The experience is private, so your group’s mood will shape the day. A cooperative team can make it lively, while a group that dislikes disagreement may find the decision-making tiring.

Most people can participate, and service animals are allowed. The activity is near public transport, which helps with reaching the start and leaving Mayfair at the end.

I would be cautious about booking it for very young children unless they enjoy riddles and can stay engaged during a long outing. The supplied information does not give an age minimum, so check with HiddenCity if age is important for your group.

Booking, timing, and cancellation advice

Confirmation is provided when you book. The experience is offered Monday through Saturday within the stated 10:30 to 18:30 operating hours, and it is commonly reserved about 31 days ahead.

That advance pattern is useful planning information. If you want a particular day during a busy London visit, booking roughly a month ahead is sensible, especially if your group needs a certain start time.

Free cancellation is available when you cancel at least 24 hours before the local start time. A cancellation inside that 24-hour window is not refunded, and changes made within that period are not accepted.

Because the activity is private, make sure your team can agree on the date before booking. Confirm the phone-number requirement as well, since it is central to taking part.

Should you book this London mystery game?

Book Moriarty’s Game if you want a private, puzzle-led walk through Marylebone and Mayfair, and if your group enjoys solving clues more than listening to a standard tour commentary. The less familiar streets, flexible pauses, and team format give the experience a clear identity.

Skip it if you need a fixed, highly informative sightseeing tour or if your phone number does not meet the stated requirement. You should also avoid placing it immediately before a timed theatre show or dinner, since the route can take three to four hours.

For the right group, $40.90 buys a substantial afternoon activity rather than a short photo stop. Bring a willing team, allow extra time for breaks, and let the mystery guide your route through the West End.

FAQ

Where does Moriarty’s Game begin?

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

Where does the activity finish?

The listed end area is Mayfair, London.

How long does the experience take?

Plan on approximately three to four hours. The stated itinerary also gives a three-hour estimate, so the exact time can vary.

What days and times is it available?

It is listed as operating Monday through Saturday from 10:30 AM to 6:30 PM during the stated operating period.

How many people can play together?

Teams can include 2 to 6 players.

Can a larger group take part?

Yes. Larger groups can split into multiple teams and play against one another.

Do I need a mobile phone number?

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

Are food and drinks included?

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

Is the experience private?

Yes. Only your group takes part in the activity.

What is the cancellation policy?

You can cancel for a full refund up to 24 hours before the local start time. Cancellations or changes made less than 24 hours before the start are not accepted or refunded.