mscroggs.co.uk
mscroggs.co.uk

subscribe

Blog

Christmas (2020) is coming!

 2020-11-22 
This year, the front page of mscroggs.co.uk will once again feature an Advent calendar, just like in the five previous Decembers. Behind each door, there will be a puzzle with a three digit solution. The solution to each day's puzzle forms part of a logic puzzle:
It's nearly Christmas and something terrible has happened: you've just landed in a town in the Arctic circle with a massive bag of letters for Santa, but you've lost to instructions for how to get to Santa's house near the north pole. You need to work out where he lives and deliver the letters to him before Christmas is ruined for everyone.
Due to magnetic compasses being hard to use near the north pole, you brought with you a special Advent compass. This compass has nine numbered directions. Santa has given the residents of the town clues about a sequence of directions that will lead to his house; but in order to keep his location secret from present thieves, he gave each resident two clues: one clue is true, and one clue is false.
The residents' clues will reveal to you a seqeunce of compass directions to follow. You can try out your sequences on this map.
Behind each day (except Christmas Day), there is a puzzle with a three-digit answer. Each of these answers forms part of a resident's clue. You must use these clues to work out how to find Santa's house.
Ten randomly selected people who solve all the puzzles, find Santa's house, and fill in the entry form behind the door on the 25th will win prizes!
The winners will be randomly chosen from all those who submit the entry form before the end of 2020. Each day's puzzle (and the entry form on Christmas Day) will be available from 5:00am GMT. But as the winners will be selected randomly, there's no need to get up at 5am on Christmas Day to enter!
As you solve the puzzles, your answers will be stored. To share your stored answers between multiple devices, enter your email address below the calendar and you will be emailed a magic link to visit on your other devices.
To win a prize, you must submit your entry before the end of 2020. Only one entry will be accepted per person. If you have any questions, ask them in the comments below or on Twitter.
So once December is here, get solving! Good luck and have a very merry Christmas!
                        
(Click on one of these icons to react to this blog post)

You might also enjoy...

Comments

Comments in green were written by me. Comments in blue were not written by me.
Nice one today (16 December) :)
Did he?... did he really?... starts to look like it... yes he did! :D
Gert-Jan
×3   ×6   ×3   ×1   ×2     Reply
@A: Aha, I should have thought of this! Puzzles completed :-)
(anonymous)
×1                 Reply
@Dean: you can also go through each answer one at a time and change a digit; if the number of wrong answers goes up then your answer for that question was correct
A
×1   ×1              Reply
@Dean: Yes, I'm planning to change how that bit works. Check back tomorrow or the next day for a more fun finish!
Matthew
   ×1              Reply
A bit harsh that we can’t tell exactly which answers are wrong! I won’t have time to revisit every puzzle - and its kind of less fun redoing something that is already correct... :-(
Dean
                 Reply
@Marty: Yes, I'm in the middle of correcting the clues page to add these details back
Matthew
   ×1              Reply
 Add a Comment 


I will only use your email address to reply to your comment (if a reply is needed).

Allowed HTML tags: <br> <a> <small> <b> <i> <s> <sup> <sub> <u> <spoiler> <ul> <ol> <li> <logo>
To prove you are not a spam bot, please type "theorem" in the box below (case sensitive):

Archive

Show me a random blog post
 2026 

May 2026

World Cup stickers 2026

Apr 2026

A new puzzle every day
Mixing Wordle with other games

Feb 2026

Christmas (2025) is over
 2025 

Dec 2025

Christmas card 2025

Nov 2025

Christmas (2025) is coming!

Sep 2025

The partridge puzzle

Aug 2025

TMiP 2025 puzzle hunt

Jun 2025

A nonogram alphabet

Mar 2025

How to write a crossnumber

Jan 2025

Christmas (2024) is over
Friendly squares
 2024 

Dec 2024

A regular expression Christmas puzzle
Christmas card 2024

Nov 2024

Christmas (2024) is coming!

Feb 2024

Zines, pt. 2

Jan 2024

Christmas (2023) is over
 2023 
▼ show ▼
 2022 
▼ show ▼
 2021 
▼ show ▼
 2020 
▼ show ▼
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

matt parker bots reuleaux polygons runge's phenomenon curvature fractals wool determinants programming sport coins tetris game show probability puzzles accuracy bluesky captain scarlet advent calendar realhats video games chalkdust magazine mathsjam palindromes logic triangles geometry coventry noughts and crosses fonts weather station hexapawn matrix of minors football manchester dataset go 24 hour maths london underground mathslogicbot mathsteroids partridge puzzle standard deviation live stream talking maths in public interpolation rugby rust books pac-man turtles raspberry pi errors pi oeis pi approximation day folding tube maps speed databet crossnumbers world cup bubble bobble python youtube draughts binary pokémon games royal institution pythagoras php wordle propositional calculus light a gamut of games pokémon wordle fence posts quadrilaterals anscombe's quartet mean probability menace matrix of cofactors news graph theory golden spiral machine learning final fantasy countdown crosswords dates stirling numbers stickers warwick bodmas european cup national lottery inline code cambridge hannah fry geogebra electromagnetic field boundary element methods javascript christmas asteroids guest posts gather town platonic solids harriss spiral map projections cross stitch regular expressions london approximation nonograms error bars reddit big internet math-off ucl trigonometry pizza cutting crochet matrices matrix multiplication estimation numerical analysis manchester science festival kenilworth hats chess gaussian elimination nine men's morris simultaneous equations recursion ternary tennis martin gardner game of life data visualisation edinburgh flexagons logs plastic ratio sound folding paper gerry anderson chebyshev frobel wave scattering rhombicuboctahedron hyperbolic surfaces people maths logo sorting craft bempp braiding correlation alphabets dinosaurs the aperiodical computational complexity datasaurus dozen inverse matrices graphs royal baby crossnumber signorini conditions sobolev spaces newcastle zines misleading statistics christmas card thirteen pascal's triangle golden ratio exponential growth latex statistics friendly squares squares tmip kings numbers preconditioning arrangement puzzles phd convergence polynomials data radio 4 finite group dragon curves finite element method arithmetic weak imposition

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2026