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Justin’s brother mixed up the pieces from two puzzles. As a result, Justin ends up with one extra piece. Can you help him find the odd one out?

A tempting slicing challenge, to be done alone or in a group. Good luck!

How do time differences work? What happens if you do a round trip?

Each student stands in a region and gives a clue about it — except for Pascal, who is sulking. The goal is simple: figure out where each student is located. However, solving the puzzle won’t be without its challenges!

Truth or lie? Help Mathilda choose the box that will land her the new job.

Help the teacher equally distribute the candies among the five friends.

Principle Estimate the amount of toilet paper needed to cover the classroom.

Principle Reconstruct the secret solids by using their projections.