More from Chalkdust
- Colin Wright remembers the puzzle giant with a passion for sharing
- We talk to the Fields medallist about his life, his work and his advice to his younger self.
- Looking for a challenge? Try our cryptic crossnumber—with hints and tips so anyone can have a go!
- Hugh Duncan returns with the long-awaited prequel in which he further explores the geometric patterns hidden behind the fractions.
- Can you solve these puzzles about differentiation and integration?
- All the fun of our prize crossnumber, just smaller and without a prize