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Christmas card 2024

 2024-12-04 
As usual, I spent some time this November, designing this year's Chalkdust puzzle Christmas card (with some help from TD).
The card contains 10 puzzles. By splitting the answers into pairs of digits, then drawing lines between the dots on the cover for each pair of digits (eg if an answer is 201304, draw a line from dot 20 to dot 13 and another line from dot 13 to dot 4), you will reveal a Christmas themed picture. Colouring any region containing an even number of unused dots green and colour any region containing an odd number of unused dots red or blue will make the picture even nicer.
If you're in the UK and want some copies of the card to send to your maths-loving friends, you can order them at mscroggs.co.uk/cards.
If you want to try the card yourself, you can download this printable A4 pdf. Alternatively, you can find the puzzles below and type the answers in the boxes. The answers will automatically be used to join the dots and the appropriate regions coloured in...
×6      ×4      ×3      ×4      ×4
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Comments

Comments in green were written by me. Comments in blue were not written by me.
I find that I can enter seven correct answers without issue. however, an eighth answer causes the entire tree to vanish.

I'm using Firefox on Windows 11.
hakon
                 Reply
@HJ: I can't reproduce that error on Firefox or Chrome on Ubuntu - although I did notice I'd left some debug outputting on, which I've now removed. Perhaps that was causing the issue.

If anyone else hits this issue, please let me know.
Matthew
                 Reply
On my machine (Mac, using either Firefox or Chrome, including private mode so no plugins) the puzzle disappears when I complete the answers for 1, 3 and 9. I'm presuming my answers are correct -- the pattern they create is pretty clear and looks reasonable.
HJ
                 Reply
I fond this card quite amusing. If I were clever enogh, I cold solve more of the problems! - Cheers from the USA
mitch
                 Reply
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