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Comments in green were written by me. Comments in blue were not written by me.
2025-12-30
Another great collection of puzzles, thank you! 21 was, indeed, a challenge. Perms and combs got there quite quickly after a long time of not getting there :) Happy holidays everyone!
Kirsty
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/blog/120
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2026
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Mixing Wordle with other games
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2025
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The partridge puzzle
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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
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Zines, pt. 2
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Chalkdust issue 17
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Logo Asteroids
Mar 2023
Mathsteroids on hyperbolic surfaces
Feb 2023
The databet
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Off-by-one errors
Christmas card 2022
Nov 2022
Christmas (2022) is coming!
Oct 2022
24 Hour Maths Game Show
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Approximating π
Feb 2022
Build your own MENACE
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Christmas (2021) is over
2021
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Dec 2021
Christmas card 2021
Nov 2021
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TMiP 2021 puzzle hunt
May 2021
Close encounters of the second kind
Jan 2021
Christmas (2020) is over
2020
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Dec 2020
Christmas card 2020
Nov 2020
Christmas (2020) is coming!
Jul 2020
Happy -15+3τ-φ-√3 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
tmip
runge's phenomenon
christmas card
thirteen
statistics
gaussian elimination
bots
hats
dates
matrix multiplication
draughts
newcastle
dataset
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speed
crossnumbers
mathsjam
video games
alphabets
gerry anderson
wordle
partridge puzzle
geometry
crosswords
estimation
bodmas
game show probability
realhats
geogebra
stirling numbers
gather town
go
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nine men's morris
interpolation
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mathslogicbot
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pi approximation day
regular expressions
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rhombicuboctahedron
binary
datasaurus dozen
captain scarlet
sport
convergence
warwick
matrix of minors
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hexapawn
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reuleaux polygons
flexagons
inline code
edinburgh
propositional calculus
friendly squares
coventry
graph theory
manchester science festival
cross stitch
cambridge
programming
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arrangement puzzles
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game of life
chess
stickers
european cup
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errors
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countdown
chebyshev
matt parker
wave scattering
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turtles
tennis
platonic solids
pac-man
coins
advent calendar
manchester
recursion
frobel
pokémon wordle
electromagnetic field
logs
harriss spiral
probability
fractals
logo
matrix of cofactors
finite element method
kenilworth
mathsteroids
pascal's triangle
live stream
boundary element methods
martin gardner
javascript
anscombe's quartet
ucl
logic
graphs
map projections
pi
zines
london underground
golden spiral
triangles
computational complexity
books
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python
folding paper
data
error bars
ternary
dragon curves
squares
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youtube
sound
misleading statistics
mean
royal institution
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correlation
chalkdust magazine
noughts and crosses
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craft
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pizza cutting
folding tube maps
kings
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hyperbolic surfaces
numerical analysis
rust
php
pythagoras
determinants
puzzles
people maths
national lottery
accuracy
royal baby
fonts
24 hour maths
numbers
wool
crochet
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inverse matrices
matrices
crossnumber
dinosaurs
polynomials
data visualisation
reddit
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a gamut of games
oeis
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braiding
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Archive
Show me a random blog post
▼ show ▼
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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 -15+3τ-φ-√3 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
martin gardner
interpolation
raspberry pi
chebyshev
finite group
standard deviation
turtles
london underground
signorini conditions
hannah fry
regular expressions
arithmetic
probability
javascript
hexapawn
misleading statistics
world cup
tennis
coventry
stirling numbers
noughts and crosses
mathsteroids
boundary element methods
pi
radio 4
python
triangles
folding tube maps
crossnumber
golden spiral
pi approximation day
squares
puzzles
polynomials
thirteen
talking maths in public
folding paper
finite element method
ternary
youtube
crossnumbers
error bars
hyperbolic surfaces
wool
geometry
tetris
cambridge
machine learning
video games
game of life
cross stitch
oeis
bots
mathslogicbot
harriss spiral
weak imposition
captain scarlet
tmip
matt parker
weather station
chess
royal institution
pascal's triangle
propositional calculus
graphs
matrix multiplication
map projections
mean
simultaneous equations
wave scattering
pizza cutting
pokémon wordle
fonts
electromagnetic field
final fantasy
realhats
palindromes
matrix of minors
arrangement puzzles
asteroids
rugby
reuleaux polygons
inverse matrices
advent calendar
graph theory
kenilworth
a gamut of games
countdown
convergence
quadrilaterals
gather town
plastic ratio
the aperiodical
statistics
books
royal baby
sorting
php
frobel
christmas
estimation
mathsjam
programming
european cup
platonic solids
live stream
golden ratio
geogebra
christmas card
games
pokémon
fence posts
guest posts
hats
logic
matrix of cofactors
crochet
zines
gerry anderson
datasaurus dozen
friendly squares
rhombicuboctahedron
accuracy
logo
pac-man
people maths
game show probability
databet
edinburgh
exponential growth
rust
nonograms
24 hour maths
light
pythagoras
ucl
alphabets
anscombe's quartet
approximation
dates
gaussian elimination
fractals
national lottery
braiding
menace
runge's phenomenon
sport
dataset
newcastle
manchester science festival
data
sound
phd
latex
binary
kings
wordle
partridge puzzle
reddit
draughts
data visualisation
determinants
logs
inline code
football
matrices
dragon curves
chalkdust magazine
london
bodmas
correlation
curvature
bempp
nine men's morris
recursion
warwick
big internet math-off
flexagons
coins
computational complexity
news
errors
bluesky
sobolev spaces
speed
numbers
stickers
bubble bobble
preconditioning
go
crosswords
craft
trigonometry
numerical analysis
dinosaurs
manchester
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