This year, he not only offers puzzles to all participants, but he personally manufactures them for us.
This special puzzle, the Archimedes' Stomachion, has a fascinating story.
It is the oldest known puzzle in the world documented by the famous mathematician Archimedes in the third century BC.
If you want to learn more about the way this puzzle came to us you can have a look at this 15 minutes talk by museum curator William Noel:
"Revealing the lost Codex of Archimedes".
A more exhaustive documentary, "Archimedes' Secret", is available on You Tube.
For all this photos, many thanks to Kris and Viktor
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