Featured series
Thinking Books for Kids
The eight-book paperback series featuring riddles, brain teasers and satisfying challenges.
Explore the series →Riddles • Puzzles • Curious minds
Welcome to the home of M. Prefontaine
Discover books and free brain challenges that make thinking fun, inspire curiosity and help every mind find its own brilliance.
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Browse every title →Books for curious minds
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More M. Prefontaine books
Word games, trivia, sudoku, football puzzles, logic challenges and more.
See the collection →Future collection
My First Activity Books
A new chapter for younger learners. This collection will be added when the books are ready.
Our approach →What we believe
Every Mind Is Brilliant in Its Own Way.
“Not every fish can climb a tree. And it shouldn't have to.”
There isn't just one way to be clever. Our books celebrate creativity, curiosity, perseverance and the satisfaction of figuring something out — at your own pace.
Read our philosophy →Free, no sign-up
Puzzle centre →Take a little brain break
New each day
Daily riddle
A little mystery, a helpful hint and a satisfying reveal.
Solve today's riddle →