More from Chalkdust
Read Issue 21 now!
Sudoku, potatoes and crossnumber's biggest secrets finally revealed in our spring 2025 issue. Plus all your favourite columns!Maths Tricks to Blow Your Mind
We review the fifth of this year’s nominees for the Book of the YearChristmas puzzle #3: Colouring by numbers
Puzzle #3 in our 2020 Christmas puzzle seriesCounting all the numbers between zero and one
Tony Pisculli dissects the lyrics from a popular songIn conversation with Ian Stewart
We speak to one of Britain's most successful popularisers of mathsPrize crossnumber, Issue 02
Win £100 in our famous original crossnumber