The Case: Mona Lisa

Each day includes three levels of help, so you can decide exactly how much you want to reveal — from a gentle nudge to the complete solution.

1. Gentle Hint
Just a little nudge.
Get a small clue that points you in the right direction without explaining how to solve the puzzle.
2. How to Solve It
Still stuck? Let’s take a closer look.
Find out how the puzzle works, what you should pay attention to and where to look for the answer — without immediately revealing the final solution.
3. Reveal the Solution
Reveal the final answer, code or password needed to continue.

Day 1

1. Gentle Hint

Name: Joseph Grünemeier

By now you know some words are missing from the riddle. If you search close enough, you will find the missing words. Try looking inside-out.

2. How to Solve It

Missing riddle words are printed on the inside of the envelope. Put them in correct places and solve riddle. Who is that mysterious person?

3. Reveal the Solution

Burglar

Day 2

1. Gentle Hint

Name: Irene Wüstler

You need to solve all math equations. Only by solving all of them you will discover all letters. Calculators allowed!

2. How to Solve It

If you did all equations correctly the riddle text is:

MY PASSWORD IS
LEMON TART – NO SPACE

3. Reveal the Solution

Lemontart

Day 3

1. Gentle Hint

Name: Joachim Kranz

The code on the bottom of the letter is your password. You need to find out what letter is represented by each part of the code.

2. How to Solve It

Search for explanations scattered all over the letter - example: "K=ABAAB" on the back, right side. Once you find all of them, you will decode the password.

3. Reveal the Solution

cookies

Day 4

1. Gentle Hint

Name: Dr. Andreas Reitler
Riddle is the cut-out attached to the letter. Cut the pieces out and see what it is.

2. How to Solve It

Once you have all of the puzzles in right spots, you should be able to see a scan of an animal. Take a closer look at the tail.

3. Reveal the Solution

squirrel

Day 5

1. Gentle Hint

Name: Nadine Zimmermann

Words on the top represent colors of balloons and the correct order of reading the riddle

2. How to Solve It

Correct order of balloons: yellow, blue, red, green, orange, pink, purple.

Riddle is about a bread - name of the breed is the solution.

3. Reveal the Solution

dachshund

Day 6

1. Gentle Hint

Name: Professor Jenz Dacher
You need to scan the safe and listen to morse code. There is an alphabet on the back of the letter.

2. How to Solve It

Morse code has a password in it. It's something that you would find on the beach by the sea.

3. Reveal the Solution

seashell

Day 7

1. Gentle Hint

Name: Ursula Vollrads

Where would you put laundry if you wanted it to dry faster but dryer wasn't available?

2. How to Solve It

Laundry is covered in thermal ink - a bit of heat will reveal the password. You can blow on it with warm air or put it on the sun.

3. Reveal the Solution

sundress

Day 8

1. Gentle Hint

Name: Hans Junkers

You need to match the letters to flags. Alphabet is printed on the bottom

2. How to Solve It

Solution is a name of a person or trade - someone who likes to steal, especially in touristy area.

3. Reveal the Solution

pickpocket

Day 9

1. Gentle Hint

Name: Henriette Henkel
You need to use the photo attached to the letter.

2. How to Solve It

Solution is a name of the figure portrayed in the picture. He's one of Roman emperors.

3. Reveal the Solution

Augustus

Day 10

1. Gentle Hint

Name: Marie Altmann
The letter on the back is the key. Try unlocking the code method or try reading it really fast.

2. How to Solve It

The letter in the back is written in a code. Try crossing out all "ub" that you find and see if it's readable now.

3. Reveal the Solution

tasteless

Day 11

1. Gentle Hint

Name: Leon Riedt

There is a code riddle on the back of the letter. Try looking for an alphabet that matches it - it is included, you just need to find it.

2. How to Solve It

Alphabet is on the inside of the envelope.

Riddle says:
When I am yours, you may wish to share me. But once you share me, you no longer have me. What am I?

Additional hint: The riddle is not about an object, but rather a concept.

3. Reveal the Solution

secret

Day 12

1. Gentle Hint

Name: Vanessa Rümpel

You need to connect pink squares into words and one full sentence.

2. How to Solve It

Start with "Th" "e pas" "swo" "rdy" ou a" 're l" "ook" "ing" "for" "is r" "ath" "er o" "bvi" "ous"
... then continue on your own....

And finish on "me."

3. Reveal the Solution

Vanessa

Day 13

1. Gentle Hint

Name: Dr. Richard Kümmel

The note in capitals is a code. The scribbles "put the last first..." are instructions on how to break the code.

2. How to Solve It

The code is about letters of words. Take last and first letter of each word starting from the last letter of first word - doctor (take r) eats (take e) glass (take s) and so on.

3. Reveal the Solution

Research

Day 14

1. Gentle Hint

Name: Mareike Meister

You need to scan qr code on the phone and listen to the recording.

2. How to Solve It

You need to listen closely to recording.
The solution is guessing where the woman who is speaking is right now. Do you recognize that sound from somewhere?

The Case: Mona Lisa

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 1

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 2

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 3

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 4

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 5

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 6

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 7

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 8

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 9

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 10

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 11

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 12

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 13

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 14

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 15

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 16

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 17

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 18

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution

Day 19

1. Gentle Hint

2. How to Solve It

3. Reveal the Solution