In one such puzzle, your mind will be baffled. In the image below, you will see ducks enjoying a swimming competition and your challenge is to find a hidden heart in the scene. Try: Math Puzzle ...

The numbers listed above are not in base 10, also known as the decimal system. Show puzzle solution The terms of the sequence all represent the decimal (base 10) number 6 as it is represented in ...

But the community that’s been working on your puzzles seems like a pretty wholesome ecosystem. In 2020, when the pandemic started, I was very lonely, so I started talking about math on Twitter. The ...

That’s why most crossword apps give users a delete option. And if you’re filling out the print crossword puzzle longhand, you don’t get extra points for using ink instead of pencil.

Print this version to keep track of what you’ve read and what you’d like to read. See the full project, including commentary about the books, here. A PDF version of this document with embedded ...