The day is finally here: issue 11 is out now! To help you celebrate launch day in style, we’ve set a puzzle hunt: throughout the day, we are posting a series of puzzles. The answers to these puzzles form clues to the four-digit code for the door to let you into the Chalkdust issue 11 secret backstage lounge.
There are five puzzles in the puzzle hunt. They are being posted every 2 hours: at 9am, 11am, 1pm, 3pm and 5pm.

Read Issue 23 now!
Sleep, coffee and cheating at Tetris feature in our SS26 issue! Plus all your favourite puzzles & columns.
Dear Dirichlet, Issue 23
Travel, trade and Tony Blackburn pepper the prof's postbag this issue
Which generation are you?
Always banging on about how numbers were better in the good old days? Take our quiz to find out how old you really are…
What’s hot and what’s not, Issue 23
Fashion is fleeting, Chalkdust regulars are not.
The Chalkdust guide to: Citation metrics
Confused by other academics telling you about their h-index? Then this handy guide may be just what you need!
Crossnumber winners, Issues 20–22
Did you solve it?
Top Ten: puzzles
The undisputed top ten puzzles this season
Cryptic crossword, Issue 23
Can you solve it?
Book of the Year 2025
For the first time in Chalkdust history, we have a double winner
Prize crossnumber, Issue 23
Win £100 of MathsGear goodies with our famously fiendish crossnumber
Book of the Year 2023
We announce the winners of this coveted prize
Prize crossnumber, Issue 11
£100 of MathsGear goodies to be won if you can solve it
What is the shape of you?
Are you a torus? A cone? Ed Spheran? Find out by answering a maximum of five easy questions
Dear Dirichlet, Issue 11
Grant applications, musical media and last-minute Olympics training are the topics readers have sent in to the professor's postbox this issue
Top ten vote issue 11
Vote for your favourite maths-themed day out
Page 3 model: Cooking spaghetti
Some saucy modelling
How to make: Ecki the polytope
Make your own Ecki
What’s hot and what’s not, Issue 11
Fashion is fleeting, Chalkdust regulars are not.
Top Ten: pictures of scorpions
The definitive chart of the best pictures of scorpions
Reinventing 2D
What a difference a matrix makes

