End of year weariness setting in? Revive your brain with some of our favourite puzzles, as chosen by our readers and the Plus team!
Bid farewell to 2011 with this puzzle from Plus reader, Paulo Ferro.
Plus reader Aziz Inan has a question for you: Which mathematician is in their prime?
Think you know how to use the numbers 1 to 9? Our colleague James Grime puts your digits to the test.
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?
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!