# Crossnumber winners, issue 04

Are you a winner?

Once again, we are delighted to be able to announce the winners of the Chalkdust prize crossnumber #4! But before we do so, here is the solution:

 2 2 2 2 4 3 5 7 1 3 3 2 2 2 6 7 6 5 4 5 1 2 2 2 7 1 5 7 7 7 4 2 0 0 2 5 7 4 2 8 0 1 4 5 7 7 7 9 6 3 7 5 9 9 3 7 1 7 0 0 0 7 1 7 5 1 9 1 0 7 7 3 6 1 9 2 7 1 7 0 0 0 7 1 7 9 6 6 9 7 0 7 2 2 0 7 8 3 9 2 0 0 2 7 5 4 0 0 1 3 5 7 9 8 2 1 8 2 7 0 8 8 1 9 7 2 4 3 6 8 1 4 7 8 3 0 8 0 0 1

The sum of the across clues was $1 435 302 478$.

### Picking the Winners

We received 75 entries, 52 of which were correct.

So without further ado, the winner of the Chalkdust Magazine issue 04 crossnumber competition is Leif Cooper, who wins a £100 goody bag from Maths Gear. The runners-up, and winners of Chalkdust T-shirts, are Dan DiMillo, Brendan W. Sullivan and Zack Wolske.

Thank you to everyone who entered the crossnumber competition! The competition will return in issue 05 of Chalkdust, released in March.

Matthew Scroggs is a PhD student at UCL working on finite and boundary element methods. His website, mscroggs.co.uk, is full of maths and now features a video of him completing a level of Pac-Man optimally.
@mscroggs      mscroggs.co.uk    + More articles by Matthew

• ### Power-up review

"Unlocking the hidden mathematics in video games"
• ### Crossnumber winners, Issue 06

Did you solve it?
• ### Solution to Christmas conundrum #4

... and the winners
• ### Christmas conundrum #4

Can you solve four puzzles to reveal the hidden message?
• ### Christmas conundrum #3

Try our nonograms! And remember, not all puzzles have a unique solution...
• ### Christmas conundrum #2

Solve this and you could be the lucky winner of a signed copy of The Indisputable Existence of Santa Claus