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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
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/blog/107
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2026
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Mixing Wordle with other games
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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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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
Feb 2022
Build your own MENACE
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Close encounters of the second kind
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2020
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Nov 2020
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Jul 2020
Happy -5+5φ+√2 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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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
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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
convergence
reddit
machine learning
folding tube maps
finite element method
graphs
geometry
coins
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arithmetic
fonts
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exponential growth
javascript
countdown
gaussian elimination
youtube
mean
turtles
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games
error bars
latex
matrix of cofactors
edinburgh
big internet math-off
finite group
live stream
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hexapawn
oeis
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menace
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bubble bobble
datasaurus dozen
anscombe's quartet
crossnumber
the aperiodical
dates
kenilworth
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kings
hats
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craft
manchester science festival
warwick
speed
gerry anderson
news
ternary
game of life
radio 4
crossnumbers
guest posts
dinosaurs
determinants
pythagoras
probability
rust
golden ratio
realhats
matrix of minors
wool
go
24 hour maths
harriss spiral
inline code
tetris
pascal's triangle
ucl
hyperbolic surfaces
tmip
arrangement puzzles
asteroids
matrix multiplication
standard deviation
trigonometry
world cup
london underground
a gamut of games
map projections
european cup
christmas
manchester
propositional calculus
correlation
flexagons
newcastle
puzzles
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nine men's morris
friendly squares
cambridge
chalkdust magazine
stickers
pi approximation day
gather town
hannah fry
logs
data visualisation
geogebra
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london
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errors
coventry
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pac-man
braiding
noughts and crosses
accuracy
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national lottery
fractals
crosswords
wordle
data
people maths
sorting
royal baby
captain scarlet
christmas card
squares
final fantasy
triangles
dataset
crochet
interpolation
chess
draughts
nonograms
mathslogicbot
thirteen
fence posts
bodmas
sport
matt parker
rhombicuboctahedron
numerical analysis
dragon curves
light
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polynomials
signorini conditions
regular expressions
pizza cutting
bots
estimation
stirling numbers
rugby
video games
logo
zines
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reuleaux polygons
databet
folding paper
mathsjam
platonic solids
mathsteroids
pi
raspberry pi
phd
preconditioning
php
alphabets
frobel
quadrilaterals
misleading statistics
python
statistics
sobolev spaces
books
weather station
royal institution
martin gardner
curvature
matrices
weak imposition
talking maths in public
football
runge's phenomenon
plastic ratio
partridge puzzle
tennis
inverse matrices
cross stitch
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 -5+5φ+√2 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
quadrilaterals
trigonometry
gerry anderson
coventry
tmip
golden spiral
nonograms
sound
manchester
radio 4
graphs
pythagoras
databet
national lottery
turtles
24 hour maths
light
kings
arithmetic
hannah fry
graph theory
stirling numbers
mathsteroids
partridge puzzle
braiding
logic
go
pokémon
people maths
dates
map projections
approximation
weather station
manchester science festival
error bars
bempp
reddit
chess
european cup
dinosaurs
convergence
craft
pizza cutting
royal baby
arrangement puzzles
bodmas
folding paper
mathsjam
asteroids
binary
hyperbolic surfaces
errors
folding tube maps
flexagons
php
latex
accuracy
statistics
javascript
matt parker
numbers
crossnumbers
games
christmas card
puzzles
ucl
signorini conditions
bots
logo
harriss spiral
runge's phenomenon
chalkdust magazine
misleading statistics
youtube
determinants
raspberry pi
crochet
pokémon wordle
squares
news
estimation
matrix of minors
polynomials
numerical analysis
mean
hats
tennis
fractals
noughts and crosses
cambridge
matrix of cofactors
edinburgh
data visualisation
sport
rhombicuboctahedron
thirteen
fence posts
martin gardner
bluesky
dataset
gaussian elimination
matrices
dragon curves
recursion
curvature
kenilworth
cross stitch
reuleaux polygons
probability
coins
rust
wave scattering
alphabets
data
golden ratio
speed
pi
menace
standard deviation
propositional calculus
python
fonts
tetris
datasaurus dozen
oeis
programming
wordle
wool
triangles
books
game show probability
video games
football
big internet math-off
matrix multiplication
palindromes
nine men's morris
rugby
electromagnetic field
regular expressions
phd
draughts
london underground
game of life
london
mathslogicbot
ternary
newcastle
geogebra
pi approximation day
a gamut of games
advent calendar
preconditioning
warwick
inline code
final fantasy
boundary element methods
correlation
inverse matrices
friendly squares
weak imposition
finite element method
chebyshev
simultaneous equations
talking maths in public
platonic solids
interpolation
zines
world cup
captain scarlet
hexapawn
frobel
plastic ratio
guest posts
computational complexity
sobolev spaces
finite group
anscombe's quartet
machine learning
exponential growth
realhats
sorting
live stream
gather town
pac-man
bubble bobble
christmas
pascal's triangle
royal institution
the aperiodical
stickers
crossnumber
logs
geometry
countdown
crosswords
© Matthew Scroggs 2012–2026
on /blog/107