There is a history of Alzheimer's in my family so most things like this interest me. It appears maths puzzles help fend off Alzheimer's which is jolly good luck since I enjoy maths puzzles - particularly Sudoku.
One of the puzzles the Telegraph examples is surprisingly difficult - a colour test. Not really a maths puzzle - but bloody difficult. You have to read out the colour of the words, which are names of not necessarily the same colour.
Read the article on the Telegraph here