Frank Passfeller
Frank Passfeller investigates mysterious criminal cases on behalf of the BKA, the Federal Criminal Police Office. Years of dealing with seemingly inexplicable events have made him an expert at thinking outside the box and making connections. After work, he invents absurdly tricky puzzles for children, teenagers, and adults.
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Veronika Gruhl
Veronika Gruhl is an illustrator from Munich. She specialises in book illustration and live fashion-style illustration at events. She draws both analogue with pencil, markers and watercolour as well as digitally. Her children's comic "The Cursed Elixir" was awarded the ICOM prize for "Outstanding Artwork" in 2019.
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9 out of 10 Can’t Solve These Puzzles (Vol. 4)
- Publication date: 20.07.2022
- 9+
- 64 Pages, 20 cm x 20 cm
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Content
You think you're clever? You think you've got it all figured out?
Well ... maybe that's true. Maybe it isn’t. A good way to find out are the riddles in this book. Countless people before you have tried to crack them, but nine out of ten have failed. Are you the ultra-smart tenth out of 10?
Warning: Some of the following puzzles are really extremely unbelievably insanely hard. This means the chances of you failing is high.
Do you dare anyway? THEN TURN THE PAGE.
• Logic puzzle packaged as a challenge
• With clues and solution pages
• Over 15,000 copies sold of the first three volumes
• Child-friendly implementation of the YouTube trend
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Frank Passfeller
Frank Passfeller investigates mysterious criminal cases on behalf of the BKA, the Federal Criminal Police Office. Years of dealing with seemingly inexplicable events have made him an expert at thinking outside the box and making connections. After work, he invents absurdly tricky puzzles for children, teenagers, and adults.

Veronika Gruhl
Veronika Gruhl is an illustrator from Munich. She specialises in book illustration and live fashion-style illustration at events. She draws both analogue with pencil, markers and watercolour as well as digitally. Her children's comic "The Cursed Elixir" was awarded the ICOM prize for "Outstanding Artwork" in 2019.
Foto: © Marian Wilhelm