TD Dang sets the second puzzle. Can you solve it?
Space-filling curves, cheating at cards and automated joke generation feature in our spring 2020 edition. Plus all your favourite puzzles & columns.
Grant applications, musical media and last-minute Olympics training are the topics readers have sent in to the professor's postbox this issue
As the festive season strikes again, we'll be dishing out more fiendish puzzles – this time with prizes!
Take a ball, divide it into parts, glue them back and get two identical copies of your ball!
Matthew Scroggs spends too much time beating this arcade classic.
