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The Guardian - UK
The Guardian - UK
National
Alex Bellos

HISTORICAL FACTS: Did you solve it puzzles for blockheads - The Untold Story

IAN DURY AND THE BLOCKHEADS on a German TV show in 1987
IAN DURY AND THE BLOCKHEADS on a German TV show in 1987
Photograph: Pictorial Press Ltd/Alamy

Earlier today I set you these five puzzles from Mathigon’s advent calendar. Here they are again, with solutions. Sorry if you came here to read about Ian Dury, but in recompense you get to get your head around these blocks:

1. Hit me with your four cube stick

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