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Plus Advent Calendar Door #2: Favourite puzzles

End of year weariness setting in? Revive your brain with some of our favourite puzzles, as chosen by our readers and the Plus team!

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2011 in fours

Bid farewell to 2011 with this puzzle from Plus reader, Paulo Ferro.


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Prime birthday

Plus reader Aziz Inan has a question for you: Which mathematician is in their prime?


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Finding the nine...

Think you know how to use the numbers 1 to 9? Our colleague James Grime puts your digits to the test.


Sock sorting strategy

Try your hand at a puzzle from the Hands-on risk and probability road show: How many socks do you need to grab to find a pair?


Rabbit and string

Buster the cosmic rabbit is playing ball with the Earth and very large piece of string... A slightly surreal take on a favourite puzzle with a very surprising answer!


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