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

London rewards the curious. Moriarty’s Game turns Marylebone and the West End into a phone-led puzzle trail, sending you through lesser-known corners toward Mayfair as the story unfolds. I like the self-paced format and the chance to see streets that rarely appear in standard sightseeing plans. The main catch is that you need a UK, US, or Canadian mobile number, and three to four hours is a sizable block of your day.

I also like that the game works for a private group of two to six people, with built-in points where you can stop for food or drinks. The puzzles are meant to be fun rather than punishing, though anyone hoping for a fast, tightly guided tour may find the open-ended format less structured.

Key points to know before you play

• Start in Marylebone and finish in Mayfair: The route links two central London areas rather than keeping you in one small pocket.
• Your phone delivers the trail: Clues, riddles, and puzzles guide your group from one location to the next.
• Small private teams work best: Groups of two to six play together, while larger parties can split into teams and compete.
• Plan for three to four hours: You have time for the game itself, short pauses, and refreshments at your own cost.
• The route favors discovery over famous sights: You visit unusual West End spots that may not appear in a regular guidebook.
• The score is strong: A 4.8 rating from 445 ratings and a 95 percent recommendation rate suggest broad appeal.

What Moriarty’s Game is really like

Moriarty’s Game: The Professor’s Invitation is part walking tour, part treasure hunt, and part group puzzle. You begin at The Marylebone, at 93 Marylebone High Street, then follow a trail of messages sent to your phone.

The story gives the walk a purpose. Instead of simply moving from one attraction to another, you are looking for clues, solving riddles, and working out what comes next. That makes the city feel like a playing board. You are not just passing through Marylebone and the West End. You are paying attention to doorways, side streets, signs, and details you might otherwise miss.

The experience is designed for teams of two to six. That is a useful limit. With two people, everyone has a clear role. With six, you have enough minds to tackle a difficult puzzle without turning the game into a noisy committee meeting.

If your party is larger, you can split into several teams and play head to head. That option gives school groups, family reunions, and friend groups a natural bit of competition. Just remember that a large party will not function as one single team unless you arrange it that way through multiple smaller groups.

The private setup is another plus. Only your own group takes part, so you can stop to debate a clue, make a wrong guess, or take a snack break without holding up strangers. It also means the mood depends on your group. A lively, cooperative team will get more from it than a group that dislikes puzzles or cannot agree on the next turn.

Marylebone: a practical place to begin

Marylebone gives the game a pleasant starting point. The meeting point is The Marylebone at 93 Marylebone High Street, a central address with shops, cafés, and public transport nearby. You are not starting in an isolated spot, which makes the first meeting easier to manage.

The opening section sets the tone. You receive a trail of clues on your phone and begin moving through the city in search of answers. The route is not presented as a conventional guided walk, so you should expect to take responsibility for reading the instructions, discussing possibilities, and deciding where to go next.

That freedom is part of the fun. I enjoy tours that make me look twice at familiar streets, and this format is built for that. It rewards a careful eye rather than a head full of London facts.

The supplied information does not name every stop or reveal the puzzle answers. That is a good thing if you want the story to remain intact, but it also means you cannot judge the exact route from a list of landmarks. Think of Marylebone as the opening chapter, not a fixed set of museum visits.

You may find yourself spending more time on a clue than on a sight. If your goal is to enter major attractions or hear a detailed account of London history, this is not the right product. If you like solving problems while walking through central London, the format makes more sense.

Secret corners instead of a landmark checklist

The experience promises locations in the West End that are not usually found in guidebooks. That does not mean you will avoid all familiar parts of London. It means the route puts more weight on side streets and less obvious places than a standard sightseeing circuit.

This is where the game earns its keep. Many London walks lead you directly to famous façades, royal buildings, and major squares. Those sights have their place, but they also attract crowds and create a predictable rhythm. A clue trail changes your attention. You might pass a well-known area while focusing on a small detail that matters to the story.

One participant described enjoying the way the game moved across a couple of London neighborhoods and revealed small streets and out-of-the-way places. That is a useful clue about the experience’s character. The value is not only in reaching the next answer. The walk gives you a reason to explore parts of Marylebone, the West End, and Mayfair that you might skip on your own.

You should keep your expectations in check. There is no guarantee that every stop will feel dramatic or photogenic. Some locations may be interesting mainly because the puzzle sends you there. That is normal for a treasure hunt. The reward comes from the combination of place and problem, not from a parade of headline attractions.

How the clues, riddles, and puzzles work

Your phone acts as the main game tool. Messages send your group onward, and you use them to interpret the route, find clues, and solve the next stage. You do not need to follow a guide holding a flag, and you are not tied to a fixed walking pace.

That setup gives you control. You can pause when someone needs a drink, spend longer on a location, or take a break before tackling the next puzzle. You can also return to the game after stopping. This is especially useful for families, since children rarely keep the same pace for three hours.

The puzzles are described as interesting but not too challenging. I would treat that as a family-friendly design choice rather than a criticism. The game aims to keep the group moving and involved, not leave you stuck at one riddle for half an hour.

Still, difficulty is personal. One team may solve a clue quickly while another needs time to test several ideas. The private format helps here because you can talk freely without worrying about strangers listening or waiting.

Bring patience and a charged phone. The mobile number requirement is specific: you need a UK, US, or Canadian number to take part. An international visitor with a different phone number should check eligibility before paying. This is one of the few hard barriers attached to the experience.

From Marylebone toward Mayfair

The route finishes in Mayfair, so the game covers more than a single neighborhood. That shift gives the walk a sense of progress. You begin in Marylebone, work through the West End, and end in one of central London’s best-known districts.

The exact streets and puzzle points are not provided in advance, which protects the story. You should therefore prepare for a route that unfolds one instruction at a time rather than a walk with a fully disclosed map.

Mayfair is a fitting final area for a mystery built around Professor Moriarty. The neighborhood is central, polished, and full of streets where a clue can feel slightly out of place. That said, the experience does not promise a specific final attraction or a dramatic staged ending. The appeal lies in reaching the endpoint after piecing together the trail.

Because the game crosses neighborhoods, wear comfortable shoes. That is ordinary London advice, but it matters here more than on a short attraction visit. You are walking for several hours, and your attention will be split between the phone and the city around you.

Break points make the long format easier

Three to four hours is a long time for a puzzle walk, but the design allows breaks at selected locations. You pay for your own refreshments, so budget separately for coffee, lunch, or a quick drink.

I like this arrangement because it avoids the rigid pace of a guided tour. You can use a break to regroup, compare answers, and let younger players rest. The stop also gives your group a chance to enjoy the neighborhood rather than treating London as a series of clues to be consumed as fast as possible.

The tradeoff is that breaks are not an all-inclusive part of the price. The $40.90 per-person cost covers the experience, not your food or drinks. A group should decide in advance who wants a full meal and who prefers to keep moving, since different choices can affect the pace.

There is also no promise that every break point will suit every group. The information confirms that stops are built into the route, but it does not name the businesses or describe seating. Consider them useful opportunities, not reserved restaurant bookings.

Is $40.90 a fair price?

At $40.90 per person, this is more expensive than a simple self-guided walk through London. You can always explore Marylebone and Mayfair without paying an activity fee. The question is what you are buying beyond the streets themselves.

You are paying for a ready-made story, a route, phone-based clues, and a shared activity that keeps a group focused. For two people, the price may feel high compared with a free walk. For a family or group of friends, it can be reasonable if everyone wants to play and the three to four hours replace another paid attraction.

The private format improves the value. Your group does not share the experience with strangers, and you can set the pace. The ability to split a large party into competing teams adds another layer for groups that enjoy friendly rivalry.

I would not book this mainly as a cheap way to see London. I would book it as a social activity that happens to reveal parts of central London. If the puzzles are the point, the price has a clearer justification. If you mainly want a guide explaining architecture and history, spend the money elsewhere.

Who will enjoy this most?

This game suits families with older children, couples who like solving things together, and friend groups looking for a different afternoon in London. It also works well for small private celebrations because the group can play without strangers joining in.

The puzzle level appears moderate rather than severe. That makes it a good choice if you want a challenge with a fair chance of progress. You will need to read carefully and cooperate, but you are unlikely to face an academic exam disguised as entertainment.

Large groups can make good use of the head-to-head option. Split into teams of two to six, set off together, and compare results at the end. The competitive version may be more memorable than having one very large team crowd around a single phone.

The experience is less suitable if you dislike walking, phone-led activities, or open-ended problem solving. It is also a poor match if your day is built around timed museum entries, since the game lasts roughly three to four hours and does not follow the pace of a standard scheduled tour.

Most people can participate, and service animals are allowed. The activity is near public transportation, which helps with both the start in Marylebone and the finish in Mayfair. No special physical requirements are given, so you should judge the walking length and city streets against your own needs.

Timing, booking, and cancellation details

The listed operating period runs from February 18, 2022, through January 21, 2027, with sessions shown Monday through Saturday from 10:30 a.m. to 6:30 p.m. Check the available start time for your date, since the game takes several hours and may occupy most of an afternoon.

It is commonly booked about 31 days ahead. That does not guarantee that every date sells out, but it is a sensible reason to reserve early if your London schedule is fixed.

Confirmation arrives when you book. You can cancel for a full refund up to 24 hours before the start time. Cancellations or changes made inside that 24-hour window are not accepted for a refund, and the cut-off follows London local time.

The experience is provided by HiddenCity. One useful sign of customer care is the provider’s response to a person who could not attend. The provider offered to accommodate that person at a later date, although you should not assume every late change will receive the same arrangement.

Should you book Moriarty’s Game?

Book it if you want a playful way to explore central London, especially with family or friends who enjoy clues and shared decisions. The combination of Marylebone, West End side streets, and a Mayfair finish gives the afternoon a clear sense of movement, while the private format keeps the experience relaxed.

Skip it if you want a traditional guided tour, famous landmarks explained in detail, or a low-cost walk with no phone requirement. The $40.90 price makes the most sense when your whole group takes part, uses the break points, and treats the puzzles as the main event.

Before booking, confirm that one participant has a UK, US, or Canadian mobile number, allow three to four hours, and plan for refreshments at your own expense. If those details fit your day, Moriarty’s invitation offers a clever change from London’s usual sightseeing circuit.

FAQ

How much does Moriarty’s Game cost?

The price is $40.90 per person. Food and drinks during breaks are not included and must be paid for separately.

How long does the experience take?

The experience takes approximately three to four hours. The route itself is described as a three-hour activity, with time available for pauses.

Where does the game start?

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

Where does the game finish?

The game ends in Mayfair, London.

What mobile phone number is required?

A UK, US, or Canadian mobile phone number is required to take part because the clues are sent to your phone.

How many people can play together?

Teams contain two to six players. Larger groups can divide into multiple teams and play against one another.

Can I pause the experience?

Yes. You can pause the game at any time, and the route includes selected points where you can stop for food or drinks at your own expense.

What is the cancellation policy?

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