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Comments in green were written by me. Comments in blue were not written by me.
2023-12-24
This year's puzzle was a roller coaster unlike last year's. Do not assume anything is true except what can be deduced. Can't wait to see what tomorrow's clue is.
Aaron
on
/blog/107
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Archive
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2026
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A nonogram alphabet
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How to write a crossnumber
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A regular expression Christmas puzzle
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Chalkdust issue 17
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Mar 2023
Mathsteroids on hyperbolic surfaces
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The databet
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Off-by-one errors
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24 Hour Maths Game Show
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Approximating π
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Build your own MENACE
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Close encounters of the second kind
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Jul 2020
Happy -9+τφ Approximation Day!
May 2020
A surprising fact about quadrilaterals
Interesting tautologies
Mar 2020
Log-scaled axes
Feb 2020
PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2
Jan 2020
PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
2019
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Dec 2019
Visualising MENACE's learning
Christmas card 2019
Nov 2019
Christmas (2019) is coming!
Sep 2019
A non-converging LaTeX document
TMiP 2019 treasure punt
Jul 2019
Big Internet Math-Off stickers 2019
Jun 2019
Proving a conjecture
Apr 2019
Harriss and other spirals
Mar 2019
realhats
Jan 2019
Christmas (2018) is over
2018
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Dec 2018
Christmas cross stitch
MENACE in fiction
Christmas card 2018
Nov 2018
Christmas (2018) is coming!
Sep 2018
Runge's Phenomenon
Jul 2018
World Cup stickers 2018, pt. 3
Mathsteroids
Jun 2018
World Cup stickers 2018, pt. 2
May 2018
A bad Puzzle for Today
Apr 2018
Building MENACEs for other games
Mar 2018
A 20,000-to-1 baby?
World Cup stickers 2018
Jan 2018
Origins of World War I
Christmas (2017) is over
2017
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Dec 2017
Christmas card 2017
Nov 2017
Christmas (2017) is coming!
MENACE at Manchester Science Festival
Jun 2017
Big Ben Strikes Again
Mar 2017
The end of coins of constant width
Dragon curves II
Feb 2017
The importance of estimation error
Jan 2017
Is MEDUSA the new BODMAS?
2016
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Dec 2016
Christmas (2016) is over
Video game surfaces
Christmas card 2016
Nov 2016
Christmas (2016) is coming!
Oct 2016
Logical contradictions
Palindromic dates
Sep 2016
Tube map kaleidocycles
Jul 2016
Solving the cross diagonal cover problem
Jun 2016
Braiding, pt. 2
Braiding, pt. 1
Making names in Life
May 2016
Euro 2016 stickers
Mar 2016
Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
Christmas (2015) is over
2015
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Christmas (2015) is coming!
Oct 2015
How to kick a conversion
How much will I win on the new National Lottery?
Aug 2015
How OEISbot works
MENACE
Mar 2015
Optimal Pac-Man
Tube map stellated rhombicuboctahedron
Logic bot, pt. 2
Design your own flexagon
Jan 2015
Tube map Platonic solids, pt. 3
2014
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Nov 2014
Logic bot
Sep 2014
Electromagnetic Field talk
Jun 2014
Tennis maths
May 2014
World Cup stickers
Apr 2014
Countdown probability, pt. 2
Countdown probability
Mar 2014
New machine unfriendly £1 coin, pt. 2
New machine unfriendly £1 coin
2013
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Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
2012
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Nov 2012
Tube map Platonic solids, pt. 2
Oct 2012
Tube map Platonic solids
Tags
stirling numbers
fonts
edinburgh
finite element method
crochet
accuracy
error bars
matrix of minors
talking maths in public
turtles
dates
statistics
estimation
asteroids
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logo
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determinants
youtube
pi
mathsteroids
sobolev spaces
geometry
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logic
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mathsjam
the aperiodical
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kings
martin gardner
weak imposition
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mathslogicbot
craft
recursion
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binary
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graphs
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map projections
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puzzles
ucl
rust
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anscombe's quartet
braiding
dataset
christmas
triangles
propositional calculus
big internet math-off
arithmetic
data visualisation
royal baby
cambridge
thirteen
london underground
misleading statistics
rhombicuboctahedron
trigonometry
golden ratio
nonograms
video games
bubble bobble
polynomials
tennis
reddit
matrix of cofactors
hannah fry
fence posts
speed
approximation
realhats
game of life
nine men's morris
draughts
data
signorini conditions
javascript
crossnumber
sound
bodmas
preconditioning
warwick
interpolation
noughts and crosses
zines
coins
rugby
datasaurus dozen
python
coventry
folding tube maps
stickers
hats
curvature
royal institution
plastic ratio
arrangement puzzles
dragon curves
latex
pi approximation day
christmas card
newcastle
oeis
pokémon
partridge puzzle
friendly squares
light
gerry anderson
hexapawn
advent calendar
countdown
world cup
numerical analysis
finite group
wool
correlation
captain scarlet
london
simultaneous equations
a gamut of games
matrices
machine learning
databet
probability
harriss spiral
go
numbers
php
bempp
hyperbolic surfaces
chess
books
sorting
fractals
live stream
tetris
inline code
regular expressions
manchester science festival
radio 4
squares
ternary
bluesky
runge's phenomenon
chalkdust magazine
exponential growth
folding paper
tmip
pizza cutting
wordle
geogebra
programming
crossnumbers
computational complexity
convergence
phd
pac-man
gaussian elimination
frobel
alphabets
dinosaurs
gather town
golden spiral
quadrilaterals
electromagnetic field
game show probability
wave scattering
bots
errors
pascal's triangle
Archive
Show me a random blog post
▼ show ▼
▲ hide ▲
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 ▼
▲ hide ▲
Dec 2023
Christmas card 2023
Nov 2023
Christmas (2023) is coming!
Zines
Sep 2023
TMiP 2023 puzzle hunt
May 2023
Chalkdust issue 17
Apr 2023
Logo Asteroids
Mar 2023
Mathsteroids on hyperbolic surfaces
Feb 2023
The databet
Jan 2023
Christmas (2022) is over
2022
▼ show ▼
▲ hide ▲
Dec 2022
Off-by-one errors
Christmas card 2022
Nov 2022
Christmas (2022) is coming!
Oct 2022
24 Hour Maths Game Show
Mar 2022
Approximating π
Feb 2022
Build your own MENACE
Jan 2022
Christmas (2021) is over
2021
▼ show ▼
▲ hide ▲
Dec 2021
Christmas card 2021
Nov 2021
Christmas (2021) is coming!
Sep 2021
TMiP 2021 puzzle hunt
May 2021
Close encounters of the second kind
Jan 2021
Christmas (2020) is over
2020
▼ show ▼
▲ hide ▲
Dec 2020
Christmas card 2020
Nov 2020
Christmas (2020) is coming!
Jul 2020
Happy -9+τφ Approximation Day!
May 2020
A surprising fact about quadrilaterals
Interesting tautologies
Mar 2020
Log-scaled axes
Feb 2020
PhD thesis, chapter ∞
PhD thesis, chapter 5
PhD thesis, chapter 4
PhD thesis, chapter 3
Inverting a matrix
PhD thesis, chapter 2
Jan 2020
PhD thesis, chapter 1
Gaussian elimination
Matrix multiplication
Christmas (2019) is over
2019
▼ show ▼
▲ hide ▲
Dec 2019
Visualising MENACE's learning
Christmas card 2019
Nov 2019
Christmas (2019) is coming!
Sep 2019
A non-converging LaTeX document
TMiP 2019 treasure punt
Jul 2019
Big Internet Math-Off stickers 2019
Jun 2019
Proving a conjecture
Apr 2019
Harriss and other spirals
Mar 2019
realhats
Jan 2019
Christmas (2018) is over
2018
▼ show ▼
▲ hide ▲
Dec 2018
Christmas cross stitch
MENACE in fiction
Christmas card 2018
Nov 2018
Christmas (2018) is coming!
Sep 2018
Runge's Phenomenon
Jul 2018
World Cup stickers 2018, pt. 3
Mathsteroids
Jun 2018
World Cup stickers 2018, pt. 2
May 2018
A bad Puzzle for Today
Apr 2018
Building MENACEs for other games
Mar 2018
A 20,000-to-1 baby?
World Cup stickers 2018
Jan 2018
Origins of World War I
Christmas (2017) is over
2017
▼ show ▼
▲ hide ▲
Dec 2017
Christmas card 2017
Nov 2017
Christmas (2017) is coming!
MENACE at Manchester Science Festival
Jun 2017
Big Ben Strikes Again
Mar 2017
The end of coins of constant width
Dragon curves II
Feb 2017
The importance of estimation error
Jan 2017
Is MEDUSA the new BODMAS?
2016
▼ show ▼
▲ hide ▲
Dec 2016
Christmas (2016) is over
Video game surfaces
Christmas card 2016
Nov 2016
Christmas (2016) is coming!
Oct 2016
Logical contradictions
Palindromic dates
Sep 2016
Tube map kaleidocycles
Jul 2016
Solving the cross diagonal cover problem
Jun 2016
Braiding, pt. 2
Braiding, pt. 1
Making names in Life
May 2016
Euro 2016 stickers
Mar 2016
Proving Pythagoras' theorem
Dragon curves
The
Mathematical Games
of Martin Gardner
Jan 2016
Christmas (2015) is over
2015
▼ show ▼
▲ hide ▲
Nov 2015
Christmas (2015) is coming!
Oct 2015
How to kick a conversion
How much will I win on the new National Lottery?
Aug 2015
How OEISbot works
MENACE
Mar 2015
Optimal Pac-Man
Tube map stellated rhombicuboctahedron
Logic bot, pt. 2
Design your own flexagon
Jan 2015
Tube map Platonic solids, pt. 3
2014
▼ show ▼
▲ hide ▲
Nov 2014
Logic bot
Sep 2014
Electromagnetic Field talk
Jun 2014
Tennis maths
May 2014
World Cup stickers
Apr 2014
Countdown probability, pt. 2
Countdown probability
Mar 2014
New machine unfriendly £1 coin, pt. 2
New machine unfriendly £1 coin
2013
▼ show ▼
▲ hide ▲
Dec 2013
Assorted christmaths
Pointless probability
Jul 2013
"Uncanny" royal coincidence
Raspberry Pi weather station
2012
▼ show ▼
▲ hide ▲
Nov 2012
Tube map Platonic solids, pt. 2
Oct 2012
Tube map Platonic solids
Tags
electromagnetic field
machine learning
palindromes
mathslogicbot
matrix of minors
javascript
oeis
crossnumbers
determinants
databet
boundary element methods
edinburgh
newcastle
menace
golden ratio
hannah fry
bempp
news
a gamut of games
books
chess
advent calendar
folding tube maps
finite element method
speed
estimation
rhombicuboctahedron
puzzles
final fantasy
logo
dragon curves
error bars
fonts
phd
chalkdust magazine
stirling numbers
graphs
wool
royal baby
inline code
coventry
misleading statistics
inverse matrices
bluesky
football
mean
ternary
countdown
crosswords
trigonometry
hyperbolic surfaces
mathsteroids
approximation
simultaneous equations
dataset
frobel
dinosaurs
flexagons
statistics
guest posts
quadrilaterals
live stream
rust
christmas
fence posts
gather town
kenilworth
royal institution
games
light
reuleaux polygons
geogebra
game show probability
martin gardner
sound
kings
pascal's triangle
pokémon wordle
folding paper
recursion
plastic ratio
binary
python
weak imposition
sport
matrix multiplication
braiding
talking maths in public
signorini conditions
ucl
matrices
craft
dates
captain scarlet
bubble bobble
geometry
london
go
24 hour maths
pizza cutting
regular expressions
standard deviation
stickers
interpolation
manchester science festival
sorting
numerical analysis
data visualisation
logic
turtles
national lottery
curvature
video games
php
datasaurus dozen
graph theory
anscombe's quartet
friendly squares
weather station
arrangement puzzles
crochet
propositional calculus
computational complexity
christmas card
the aperiodical
cambridge
logs
map projections
wave scattering
chebyshev
convergence
people maths
programming
pac-man
pokémon
draughts
harriss spiral
realhats
probability
european cup
raspberry pi
bots
crossnumber
matt parker
accuracy
tetris
reddit
zines
nine men's morris
wordle
thirteen
tmip
platonic solids
data
hats
nonograms
big internet math-off
gaussian elimination
runge's phenomenon
partridge puzzle
latex
noughts and crosses
cross stitch
radio 4
gerry anderson
finite group
rugby
matrix of cofactors
asteroids
coins
manchester
warwick
alphabets
game of life
mathsjam
world cup
london underground
squares
exponential growth
numbers
fractals
golden spiral
pythagoras
youtube
arithmetic
polynomials
hexapawn
errors
bodmas
pi
tennis
preconditioning
correlation
sobolev spaces
pi approximation day
triangles
© Matthew Scroggs 2012–2026
on /blog/107