A Prague postcard in Nancy Drew: Mystery of the Seven Keys
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Nancy Drew Mystery of the Seven Keys Walkthrough

She can solve any case!

The Nancy Drew Mystery games are an excellent series of puzzle adventures with great storylines. If you’re playing Mystery of the Seven Keys, read on for my full walkthrough and all the puzzle solutions you need.

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If you want to later continue through the game with us here at Pro Game Guides, click through to my Nancy Drew Mystery of the Seven Keys Walkthrough, Part 2

Nancy Drew Mystery of the Seven Keys complete walkthrough guide

In this adventure, Nancy is visiting the beautiful city of Prague for the first time. After speaking to Adela and Patricie in the cafe (ask who the gems were stolen from, and then select the blonde lady who is standing as the genuine Adela) you can begin the main game. This walkthrough covers the puzzles in normal mode. Note that some puzzles are slightly different in hard mode.

Explore the cafe

The door end of the cafe in Nancy Drew: Mystery of the Seven Keys
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Speak to Patricie (a1) again (she is now behind the serving counter) to find out where the postcards are. Take the Pen from the counter (b1), and the three Postcards from the other end of the counter (a2), and then tick those items off your task list Next, you need to figure out the Wi-Fi password, which is IBRIK1708 (you will find this on the wall (a3) near the door). Now you just need to select a postcode in your inventory and use the pen on the postcard to complete the task. 

The back end of the cafe in Nancy Drew: Mystery of the Seven Keys
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As you re-enter the cafe afterward you’ll get a text from Unknown with an unknown file. The message reads fall in love with our past, find your own way. This is referencing the names of the book sections around the walls of the cafe (see the History example below). The answer to the riddle is:

The history bookshelf In Nancy Drew: Mystery of the Seven Keys
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  • 11 (Romance) - Fall in love
  • 6 (History) - With our past
  • 9 (Travel) Find your own way

Enter the passcode 1169 into the message and it will open to reveal a map. This leads you to a bookcase in the corner of the cafe (b2) where a close-up of the shelves reveals a clickable book.

Opening the compass book

The compass book on the shelf In Nancy Drew: Mystery of the Seven Keys
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The key to the solution is that the numbers on the map match the inner and outer sections of the book cover depending on whether they’re on the inside or the outside of the walls of the cafe. Also, note that the compass is upside down. This means you have:

  • 6 = NE
  • 4 = E
  • 3 = SW
  • 1 = W

Each pair of outer numbers adds up to the inner number between them. So, as we have 1 at W and 3 at SW, this means the S number must be 2 (2+1=3). The full solution is below. Once the numbers are in place, click the N in the middle of the book to open it and take the key.

Thrcompass code book In Nancy Drew: Mystery of the Seven Keys
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Meet Adela in the cafe

Speak to Patricie and ask what coffee she would recommend. After the conversation move to the table by the window (a5), click the seat to sit down, and Adela will arrive. Run through all the conversation options and take her list of suspects. 

Helping around the cafe

  • The coffee handle In Nancy Drew: Mystery of the Seven Keys
  • The coffee basket In Nancy Drew: Mystery of the Seven Keys
  • The cage recipe book In Nancy Drew: Mystery of the Seven Keys

Speak to Patricie once more to find she needs some help around the cafe. The three items she needs are in the images above.

  • Find the recipe book (first image above): Walk from the counter past where Adela is sitting. Before you get to the wall, you’ll see a wooden case on your left with a plant pot and a book on it. This is the recipe book. 
  • Find the portafilter basket (second image): This is on the floor by the plant next to the entrance to get behind the counter where Patricie is standing.
  • Find the portafilter handle (third image): The handle is on the counter, by the entrance door, in front of the straws.
Makimng coffee In Nancy Drew: Mystery of the Seven Keys
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Return to Patrice and talk to her again. She’ll take the items and you’ll start a coffee-making mini-game. You’ll need to prepare the following drinks:

  • Cafe con hielo: Single coffee shot, two pours from water jug, one caramel
  • Latte: Double coffee shot, three steamed milk, then fill in the key pattern 
  • Flat white: Double coffee, two steamed milk, one sugar, fill in the crown pattern
  • Sweet sunrise: Double coffee, one cold milk, vanilla, sugar
Making frothy coffee art In Nancy Drew: Mystery of the Seven Keys
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Note that you don’t need to put the ingredients into the cup in any particular order and that once you're done decorating, the word Serve will appear (see above). Once you’re done helping her, Patrice will give you a Snow Globe

Investigate Adela’s list

The suspects list note In Nancy Drew: Mystery of the Seven Keys
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Select the note from Adela in your inventory and open it up. 

SecondShine

Finding the SecondShine contact In Nancy Drew: Mystery of the Seven Keys
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Click the web address, accept the Wi-Fi popup (protected by Loutkari), and scroll to the bottom to get a number for Hans Feirsinger, and call. He will tell you the jewels are securely stored in Germany using DEGAS.  

Vladena Zlaty

Annotated map of Castle Square in Nancy Drew: Mystery of the Seven Keys
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You need to find Zlaty Custom Jewelry. Leave the cafe, turn right, and follow the wall until you get to the store (c3 above). You can only head inside once you’ve examined the note. Once inside you’ll talk to Vladena. Go through all the chat options to find she had to change the DEGAS entry after getting the jewelry back from SecondShine.  

Oskar Dvorak

Click his telephone number to add it to your phone, and then call him. He will invite you to the exhibition. Walk through the back of Vladena’s shop (rather than going outside) and you’ll find yourself in the exhibition. Go through all of Oscar’s dialogue questions to find he trusts DEGAS, and then take a look around the exhibits. 

Now use Messenger to try and call your dad. When you can’t get through, message Ned. now you need to go back to the cafe and call him. He has nothing concrete, so you need to call the Hardy Boys next. Call Frank and Joe Hardy, who say they can get you the DEGAS file you need but that you’ll need a laptop to access it. 

Finding a laptop

Leo in the cafe  in Nancy Drew: Mystery of the Seven Keys
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Speak to Patricie in the cafe and she’ll tell you the location of a store to visit to get a laptop. At the end of the conversation, she’ll also give you a coffee to deliver to a customer. The drink is for Leo (above), who came over to the table when you were speaking to Adela. Give him the coffee and run through the chat options to find he is a priest at the cathedral (he’ll invite you to visit him there).

The way to Old Town Square  in Nancy Drew: Mystery of the Seven Keys
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Leave the cafe, turn right, go to the opposite corner from the jewelry shop (see above), and through the gate there into the Old Town Square. The computer store is on your left when you arrive. Head inside and speak to the assistant, Elka, behind the counter.  You’ll find out she is learning about cyber security while she sells you a laptop, but also that it is missing its charger

After speaking to Elka, walk through into Marek’s store next door (you don’t need to go outside). He’ll tell you the key you found is one of the seven keys of Prague. As you leave Radek (a puppeteer) comes into the store and talks to Marek. He suggests you check out his marionette show in the square. This allows you to tick off the visit Aparat task. 

The marionette show

The marionette stage  in Nancy Drew: Mystery of the Seven Keys
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Go back toward the cafe and talk to Radek at the marionette stage (C2, above). He needs you to help him set up the performance. You need to set up seven scenes by putting together the correct puppet, prop, and line. Once you have a scene set correctly, click Action to see if you’ve got it right and can move to the next scene. Note that there is always a puppet (A) and a line (C), but not always a prop (B).

The marionette puzzle in Nancy Drew: Mystery of the Seven Keys
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Scene 1

  1. Marie Theresa, no prop, Good day to all of you…
  2. Royal Scribe, no prop, Ahem, yes…
  3. Marie Theresa, Scroll, You see…
  4. Royal Scribe, Scroll, And yet you were crowned…

Scene 2

  1. Charles IV, Crown, Stop!
  2. Marie Theresa, no prop, The king who led…
  3. Charles IV, Crown, Yes.
  4. Marie Theresa, Bridge, The King who built…
  5. Charles IV, Crown, The same.

Scene 3

  1. Royal Scribe, Scroll, Oh, you did so much…
  2. Charles IV, Crown, Well, you could go on…
  3. Marie Theresa, no prop, Not anymore!
  4. Rudolf II, Crown, Me - Hello!
  5. Marie Theresa, no prop, You deserve the crown?

Scene 4

  1. Rudolf II, Crown, Well, I brought Prague…
  2. Royal Scribe, Scroll, Excuse me…
  3. Rudolf II, Crown, Yes there is that…
  4. Marie Theresa, no prop, That’s nice…
  5. Rudolf II, Crown, Help the people?
  6. Marie Theresa, no prop, Ha!

Scene 5

  1. Royal Scribe, Scroll, The story goes…
  2. Marie Theresa, no prop, Until the Czech Estates…
  3. Leopold II, no prop, Exactly right.
  4. Marie Theresa, no prop, Who are you?

Scene 6

  1. Leopold II, Crown, I am your son!
  2. Key Maker, Keys, At your service.
  3. Leopold II, Crown, And I gave those keys…

Scene 7

  1. Marie Theresa, no prop, You were right…
  2. Key Maker, Keys, Here, your grace…
  3. Royal Scribe, Scroll, And the keys have been safe…

After that, you can watch the performance and then speak to Radek. He’ll explain that the seven keys are what, according to legend, keep the Crown Jewels safe. A person would need all seven keys to enter the vault and they are all held by different important people.  

Getting the DAGAS file

The evening entrance to the exhibition in Nancy Drew: Mystery of the Seven Keys
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Go back to the exhibition (next to the jewelry store and where you met Oskar). There is no one there, so head up the staircase and follow the corridor. After a short walk, you’ll get to a door and overhear a conversation involving Oskar and the Dean’s secretary. When it finishes, check your message from the Hardy Boys telling you they’ve sent you the DAGAS file.

The laptop charger in Nancy Drew: Mystery of the Seven Keys
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Leave the exhibition area and go back to the cafe. Take the charger from the table (see above), open the laptop in your inventory, turn it sideways so you can see the power port, and add the charger. You’ll now get a picture of the laptop screen.

The laptop just before it is hacked in Nancy Drew: Mystery of the Seven Keys
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Click the email icon, enter the Wi-Fi password (IBRIK1708), and download the DAGAS attachment. Close the email app and the DEGAS file will be in the middle of the screen. Click it to open it and then attempt to complete the jigsaw puzzle. You’ll get hacked before completing it, so Patrice suggests you take the laptop back to Elka at Aparat Computers. 

At Aparat Computers

Elka's monitor in Nancy Drew: Mystery of the Seven Keys
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When you arrive, the store is closed but Elka lets you in. You give her your laptop and phone and she takes them away to check them. While she is gone, go behind the counter and examine the desk. Select the keyboard to turn the computer screen on )see above). You can look at everything else on the desk (the colored pen, cyber safety sheet, and the photo of Elka with her mother) but you don't need to remember anything specific.

Marek's desk in Nancy Drew: Mystery of the Seven Keys
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Now go next door and look at the area behind Marek’s desk. Open the drawer (d1) and use the keys on the desk (d2) to open the box inside (d3). Note the will (d4) on the desk (giving everything he has to Elka), the old damaged lock (d5), and the eggs and stamp in the box (d3). Nothing is useful yet and you can’t take anything from either location.

The Cyber Block security puzzles

As soon as you go back into the computer shop Elka will return with your devices. After speaking with her she’ll give you some cyber security training (in the shape of a puzzle). The puzzle has two levels to beat, each of which has to be beaten in 29 turns.

The first cyber puzzle in Nancy Drew: Mystery of the Seven Keys
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Move orthogonally (up, down, left, right) around the grid. You can push red tiles out of your way and need to collect all the green tiles on each level to beat it. The full solutions are below.  

  • Puzzle 1 (above): Up, left, up, right, up (x3), left, up, down, right (x3), up, right (x2), down, right, down (x2), left, down (x2), right, down, up, left (x2), down.  
  • Puzzle 2 (below): Right, down, left, down (x2), left, down (x3), up (x2), right, down, right (x3), down, up, right, up, right, left, up, left, up (x2), right, up, right. 
The second cyber puzzle in Nancy Drew: Mystery of the Seven Keys
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Once completed, you’ll get a call from Agent Zane Garrett about the DAGAS file. He says to look at the dates when the item was transferred. This ends the day.

A morning visit to the Marionette Theatre

Inside the marionette caravan in Nancy Drew: Mystery of the Seven Keys
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After a brief cutscene during which you’ll get a warning to drop the case, you’ll be back outside the cafe. Ned calls, but just to tell you about deadends. Next, Adela calls for an update and lets you know that she visited Marek’s store before she sent the jewelry away. Head over to speak to Radek once more across the square.

After speaking to him, climb into the box where he does the shows and take a look at the desk (see above). The clipboard (e1) shows a huge cash donation from Loutkan, the cyber security firm. Use the chisel (e2) to pry open the red box (e3) and find out his new performance will be Rezidente’s True Tale

Speak to him afterward about how many puppets he has and he’ll say 10. When you mention the fact he said he was waiting for his 12th puppet from Marek, he gives you a panicked reply. Head back to the cafe and speak to Patricie. She’ll tell you that the Rezidents are a secret group of underground criminals who stalk the shadows of Prague. 

Cracking the safe - maths puzzle solution

  • A device piece for cracking the safe in Nancy Drew: Mystery of the Seven Keys
  • A device piece for cracking the safe in Nancy Drew: Mystery of the Seven Keys
  • A device piece for cracking the safe in Nancy Drew: Mystery of the Seven Keys

Now return to Vladena in Zlaty Custom Jewelry. She confirms Marek is a skilled artisan who would likely have the know-how to tamper with the necklace. She then leaves to speak to Oskar, allowing you to try and crack her safe. To do this, you first need to assemble a tool. You’ll find the first part of the tool on the round table in the corner, the second in the penholder in the desk close-up, and the third next to the large white gemstone (see above). 

The completed device for cracking the safe in Nancy Drew: Mystery of the Seven Keys
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Combine the three pieces in your inventory so that the scratch in the metal in each piece lines up (see above). Now move to the poster on the other half of the desk (see below) and line the device up in the close-up so the four numbers create the equation on the two metal pieces. Also, note that each hole has a number of lines next to it showing the digit in the sequence that is part of the code (so three lines next to 4.5x3 will give you 3).  

Using the safe cracking device in Nancy Drew: Mystery of the Seven Keys
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Finally, note the order of the sun and moon symbols above the safe and how they equate to the diagrams on the desk (see below). This leaves you with the code 5457. Use this to get into the safe and take the document inside. As you step back out from behind her desk, Vladena returns. Before you leave, she tells you Oskar was an assistant when the gems were stolen in London.

The diagram showing the suns and moons for the safe code in Nancy Drew: Mystery of the Seven Keys
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For more on Nancy Drew here at Pro Game Guides check out Best Nancy Drew games of all time and All Nancy Drew Game Abbreviations – Acronym List!


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Author
Chris Marling
Chris Marling is a writer and editor with more than 20 years of experience across newspapers, magazines, and websites. Based in the UK, he has written professionally on everything from tech to tearooms. But his real passion is gaming, going right back to the Atari 2600 - and especially RPGs and MMOs. He cut his teeth on games such as The Realm and Anarchy Online. But 20 years on still gets excited about exploring each new world. When not online, you'll find him gaming analog-style around the table. Chris has had five of his own board games published, including Pioneer Days and Armageddon.

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Nancy Drew Mystery of the Seven Keys Walkthrough

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