Nancy Drew Mystery of the Seven Keys Walkthrough, Part 3

In the puzzle adventure game Nancy Drew: Mystery of the Seven Keys you get to explore the mysteries of Prague’s old town and castle. If you’re a little bit confused or stuck on a puzzle, read on for part 3 of my complete guide and Mystery of the Seven Keys walkthrough.

Nancy Drew Mystery of the Seven Keys complete walkthrough guide, part 3

Investigating Adela

It’s time to see if Adela’s calls arriving just after you escaped the tunnels, twice, is a coincidence. Enter the cafe and talk to Patricie. She’ll agree to help you distract Adela, so now you can go and sit with Adela at the usual table. When Adela leaves to help Patricie, you can search Adela’s bag.

This section is timed, so you need to be quick (don’t worry though, as you’ll always get unlimited second chances). Open the metal box you find inside and slide the letters to make the words (top to bottom) jewel, spire, and clock. Inside you’ll find the necklace and proof she’d failed to insure it. As long as you have looked at the necklace and insurance document before she gets back, you’ll be OK. 

Once you finish snooping, Adela will return and give you the translations you asked for yesterday. She has found three riddles inside, which you can find on the Information page of the Clues section of your Journal. Talk to Patricie about the riddles too, as she can give you hints about each one.

Solve the journal’s riddles

Born in fire, I am left cold…

Head over to the exhibition and enter the Haunted Tour by clicking the poster as you did previously. Head over to the suit of armor. You need to click the dots (see above) so that the flowing white line of light that moves across the armor flows uninterrupted. 

The number of times you need to click each spot is shown above. You’ll know when you have it right because the five dots will disappear, leaving just one on the helmet. Click it to open the faceguard and take one of the missing pages. 

We are brothers of the sun…

Come out of the haunted tour and go up the stairs towards Leo’s office. As you go through the door towards his office, you’ll see a table covered in candles on your right. Select the coin in your inventory (that you got from the cupboard in the alchemy lab) and use it in the slot marked above to get a close-up look at the table.

You need to select the correct candles by clicking them until only the letters that make the Latin word Cuprum are left highlighted. Each candle will light up, or dim, the four letters around it. I’ve indicated the correct order to click the candles in the image above. Once done, you’ll receive another missing page (see the arrow above). 

We divide the world…

Head over to the cafe and examine the model of the astronomical clock (above). Start by messaging Ned gives you a lot of information on the clock. It needs to be set to the date and time Rudol II was coronated, on November 1, 1575, at 6 o'clock. 

The bottom section of the clock shows the months in images, with the woodcutter (A, above) depicting November. Set this in the top spot by clicking the figure on the left with the shield (B). Click the figure on the far right (C) until the day marker is on 1, and a golden device will appear. Line up the sections as they appear above (D) and this part of the puzzle is solved.

Now examine the top section of the clock and set the date here too (see the positions of the two hands, E and F, above, as well as the month G). This is tricky and just a case of trial and error as you move the clock hands. You’ll know when you have it exactly right as the clock face will open up, allowing you to take a key.

Now zoom in on the top of the clock, where two doors have opened to reveal two keyholes. Click one of the keyholes and you’ll automatically use the key. This opens a door at the bottom of the clock (above), allowing you to collect a missing journal page. 

You’re being followed…

Call the police on your phone to find that, as far as they’re concerned, he got on the flight to Rome. Now call Zane for an update. He is on his way to Rome to check if Leo really did take the flight and arrive safely. 

The next time you switch between Old Town Square and Castle Square, you’ll get a brief cut scene in which it appears you’re being followed. Message Ned to let him know before devising a trap for whoever is following you. From outside the cafe, head directly forward to the food huts (see above). Look to the right to see a pile of rubbish and then examine it to find and take a Screwdriver. 

Now look right from where you are and use the screwdriver to pick the lock of the gate there. This involves a bit of timing, as you have to stop the slider in the green area four times in a row to succeed. Once it's open, head through. 

Pick up the hammer and the boxes, and then head up the stairs. Place all the boxes into the transparent spaces at the top, then use the hammer to remove the bolts holding the gangway in place (make sure to do this from the edge or you’ll fall).

Finally, click the transparency of your phone on the box here to set the trap (the slideshow above shows all the steps).

Making the seven keys

After speaking with Marek and Radek, Marek will give you a Rezidente Pin and you’ll head back to Aparat Computers and speak to them again. To make the keys you’ll first need to match the corect gems to the key diagrams. The riddle will give you the following, from left to right:

• Top row: rubellite, sapphire, spinel
• Bottom row: pearl, emerald, aquamarine

Uncover the Loutkari agent

Talk to Marek to devise a plan, and he’ll give you the Key Sketch and Radek’s Bag which contains a tracker. Head to the statue next to the marionette trailer and drop the bag as instructed (see above). Once you’ve dropped the bag, head back to Aparat Computers and talk to Marek again. He will give you a Tracker so that you can follow the movement of the keys.

Go back to where you placed the bag for the drop and the tacker will automatically start working. Move around until the beeps get closer together These are the spots:

1. Next to the couple sitting on the bench
2. In front of the church
3. The gate out of the square (go through)
4. The pavement by the road directly forward from coming through the gate
5. The left-side doorway into the building. Go inside. 

You’ll find yourself in some tunnels. The trace is easy to follow in the tunnels and, despite messages saying you must hurry, there is no time limit. You'll go through three sets of tunnels and eventually arrive back at the entrance to the alchemy lab. Use the snow globe to open it and head inside. Find out who the culprit is!

Find an antidote!

After the culprit poisons you and escapes you need to use the alchemy table to concoct an antidote for the poison she has thrown at you. Pick up the poison bottle from the floor (see above) and then check the recipe hanging above the alchemy table (the one you need is the third one down).

Now use the alchemy table to make the potion as you did previously, using the poison in your inventory on the table to be able to examine it and start the process. Note that if you’re too slow to make the antidote you’ll die (but as always, you have unlimited second chances). The order for making the antidote is as follows:

1. Add 1 to A
2. Add 2 to A
3. Place the contents of A into B and use B to make white powder
4. Place B back into A
5. Add 3 to A
6. Place A into C (which becomes liquid back in A)
7. Add 4 to A
8. Place A onto D

Now you can click the completed potion on the table (where you placed the poison) to cure the poison. 

Pursue the poisoner and escape

There’s a door opposite the alchemy table next to the alchemy cabinet. Click it to open the door and follow the passageway.

In the room at the end, you’ll find Adela’s gems. Pick them up and then click the laptop to call Elka and Malek. Now you can leave the room through the wooden door. 

The seven keys puzzle

You’ll now find yourself next to an ornate door. Pick Marek’s bag up from the floor to the left of the door, and use it on the door to begin a lock-matching puzzle. You can see the solution above, but you must do this puzzle in the following order:

1. Place A into 1 and then click the key in the lock to reveal the other keyholes. 
2. Match the remaining keys to the locks (B2, C3, D4, E5, F6, G7)
3. Turn 1 once more
4. Now turn the locks in number order, starting with 2 (2,3,4, etc)

This will open the door, so head through to the next door.

The biometric lock

You’ll be joined by Elka, who wants to help. After speaking with her about the police, select the fuse box on the door to get power running back into the lock on the door (both marked above). 

You’ll first need to solve the fuse box puzzle. To complete this you need to click the dials on either side of the fusebox to turn the associated dials. I’ve marked how many times each dial needs to be clicked above, but do them in the following order:

1. Top left: Twice
2. Middle left: Once
3. Top right: Three times
4. Middle right: three times

Now you can break the biometric lock. This is another upgrade in the difficulty of the cyber locks but the principle remains the same. There are three levels of security and the full solution is below:

1. Up, right, up (x2), left, up (x2), right, down, right (x2), left (x2), up (x2), right (x3), down, right (x2), up, down, left (x2), down
2. Up, right, up (x2), left, up, down (x2), left (x2), down (x2), left, right, up (x4), left, right, down, right, left, up (x2), right, down, right (x4), left (x6), right, down (x2), left (x2)
3. Up, left, up, right, up, left, up, right, up, left, up (x2), right, up, right, down, right (x3), up (x2), right, left (x3), up (x2), right, up, down, right (x2), up, left, up (x3)

Click the door lock once more to trigger a conversation with Elka. It seems she isn’t as she seemed and is out to gain revenge for her mother’s death, by framing Malek for the crime. She has been working with the suspect! 

The crown jewels and the gems

After the conversation, you’ll find yourself inside the vault with Vladena and also Leo, who is on the floor incapacitated. Vladena has a knife and forces you into switching the gems on the crown. On the plus side, you took Elka’s taser ring as you pushed her away and jumped into the vault. 

Place each of the gems into its correct place on the crown (see an example above) and then rotate each of the gems until they’re at the correct angle. You’ll know each one is done when you can no longer alter its position. 

Once you’ve finished setting all five gems into their correct positions, examine the missile of the crown and hover over the section I’ve highlighted above. You now need to place the taser ring that’s in your inventory into this spot. However, note the eye at the top left of the screen. This represents Vladena watching your every move, but she does get distracted.

You have to wait until the highlighted area from the eye is turned away from the crown before you place the taser ring. Otherwise, you’ll get caught and have to start the gem-placing process again.

Escaping from the crown jewels room

Vladena will try to put the crown on once you’ve placed the ring, and she’ll be shocked unconscious. Speak to Leo who will inform you there is another way out of the vault that you can escape through while Vladena is incapacitated. Note that this section is also timed, but you’ll get the usual unlimited number of second chances. 

To escape the room, you need to activate five of the candle holders in the room in sequence. The order is determined by the number of candles in the top section of each one, starting with the one holding just one (pictured below) and then using the ones with two, three, four, and five candles respectively. This opens a secret door. Head through, speak to Leo, and then go down the corridor next to the staircase. Use the screwdriver to pick the lock (exactly as you did earlier) and escape. 

Congratulations, after checking your messages and speaking to the team one more time, you’ve completed Nancy Drew: Mystery of the Seven Keys! For more on Nancy Drew here at Pro Game Guides check out the Best Nancy Drew games of all time!