Pen name · Kalderno
Advent calendars in book form for kids, tweens and teens: one page a day until Christmas.
Challenges, big questions, puzzles and missions, picked by age, for the grown-ups who give them.
Aria Stern is a pen name published by Kalderno.
Each one has 24 days, one for each day from December 1 to Christmas Eve. Age ranges come from the book covers where they are printed.
Ages 13 to 17 · Seen on TikTok
72 challenges, tricky puzzles and hilarious missions
Three missions a day for 24 days: challenges, puzzles and missions for teens who say there is nothing to do. A Christmas countdown activity book for boys and girls.
Full color · Seen on TikTok
24 days of big questions and mind-blowing answers
A kids encyclopedia on science, nature and more, one big question a day, with a small experiment to try at home. Hosted by Professor Murph, a raccoon who cannot stop asking why.
Teens
Mysteries and detective cases with logic puzzles, brain teasers and riddles.
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Girls 12 and up
A 24-day handbook on confidence, independence, making friends and real-world skills.
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Boys 12 and up
What school does not teach: money, cooking, independence and more.
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Teens
The Murphy's Law Advent Calendar Book for Teens
Cheat codes and life skills for school, friendships and family life.
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Kids, tweens and teens
Coloring pages, photocards to cut out and idol fashion design challenges.
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Ages 8 to 12
Lifehacks, comics, laws of bad luck, secret tricks and mini experiments.
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Ages 8 to 12
24 levels to Christmas: mazes, word searches and logic puzzles, all on paper.
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Kids
Short stories and puzzles with video game abilities, one a day.
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Kids
Facts, trivia, stories and activities on science, the Earth and animals.
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Ages 7 to 13
Silly games and tricky questions for 24 days of dinner-table debates.
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Kids
Stories and puzzles about confidence, mental toughness and team spirit.
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Kids vs. adults
A 24-day question and joke game for the whole family.
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Adults, kids and grandparents
24 photo challenges counting down to Christmas, with room to paste in your pictures.
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Ages 4 and up
504 picture charades, so even children who cannot read yet can play.
Ages 7 to 13
Over 300 would-you-rather questions for road trips and sleepovers.
Kids
Challenges, games and puzzles for screen-free afternoons.
Picture book
A warm, funny picture book about one magnificently doomed barbecue.
Real pages, the way they are printed.
Aria Stern makes activity books, puzzle books and Advent calendars in book form for kids, tweens and teens, and for the grown-ups who give them.
Most of the books are built around one page a day: a challenge, a question, a puzzle or a mission. The pages are playful on the surface and planned underneath, so a day works at the kitchen table after school.
Aria Stern is a pen name published by Kalderno.
For parents and gift-givers
Good to know
Pages from these books appear in short TikTok videos. If you saw one there, the book is listed above under its full title.
This page shows real interior pages, so you can see what a day looks like.
An independent publisher in Limassol, Cyprus. The imprint and contact details are linked at the bottom of this page.
This site sets no cookies and runs no tracking, and it never asks a child for anything.
Aria Stern is a pen name published by Kalderno. Under this name we publish Advent calendar books, activity books and game books for kids, tweens and teens.
Pick by age. For teens, try Ugh... I'm BORED! (ages 13 to 17), the Riddle & Puzzle Advent Calendar or the Teen Girl's and Teen Boys' life skills calendars. For younger kids, WHY?! and the Murphy's Law and Video-Game-Style calendars (ages 8 to 12) are good places to start.
The Advent calendars have 24 days, one for each day from December 1 to Christmas Eve. Each day takes one page.
No. The books are used on paper, and nothing on this site asks a child for information.
Yes. Aria Stern also publishes German picture books, Montessori-inspired first books and game books. You find them on her Kalderno author page.
All of the books are sold on Amazon. Each card links to the book page or straight to the book on amazon.com.
