More from Chalkdust

I’m counting on it
Joe Celko looks at four different abacuses used throughout history
Crossnumber winners, Issue 15
Did you solve it?
Chalkdust Book of the Year 2020
We announce the shortlist
Christmas puzzle #3: Colouring by numbers
Puzzle #3 in our 2020 Christmas puzzle series
Counting Countdowns
Colin counts Countdown's contingent of conundrum causing calculations
Crossnumber winners
Are you a winner?
