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Comments in green were written by me. Comments in blue were not written by me.
2024-12-27
@
Seth Cohen
: Thanks Seth, I solved it by looking at the 5×5 picture and thinking harder. Thanks to Matthew for another enjoyable set of puzzles. I look forward to reading the proper solution.
Reza
on
/blog/111
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Assorted christmaths
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"Uncanny" royal coincidence
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Archive
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2026
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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
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Dec 2023
Christmas card 2023
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Christmas (2023) is coming!
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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 ▼
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Dec 2022
Off-by-one errors
Christmas card 2022
Nov 2022
Christmas (2022) is coming!
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24 Hour Maths Game Show
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Approximating π
Feb 2022
Build your own MENACE
Jan 2022
Christmas (2021) is over
2021
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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
youtube
coventry
christmas card
edinburgh
matrices
geogebra
zines
php
fractals
databet
determinants
latex
draughts
mathsjam
puzzles
turtles
javascript
errors
boundary element methods
finite element method
dataset
hats
braiding
world cup
exponential growth
inverse matrices
royal baby
chalkdust magazine
platonic solids
pythagoras
ternary
menace
dinosaurs
tmip
machine learning
matt parker
light
interpolation
graphs
plastic ratio
matrix multiplication
coins
logic
sound
thirteen
mathslogicbot
pi
hexapawn
manchester
hyperbolic surfaces
warwick
a gamut of games
cross stitch
christmas
misleading statistics
pokémon
signorini conditions
wordle
dragon curves
people maths
royal institution
games
ucl
advent calendar
map projections
gather town
chebyshev
geometry
books
golden spiral
triangles
newcastle
numerical analysis
quadrilaterals
electromagnetic field
python
realhats
captain scarlet
sobolev spaces
countdown
video games
harriss spiral
arithmetic
data
datasaurus dozen
rugby
bempp
polynomials
data visualisation
nine men's morris
logs
game show probability
kenilworth
numbers
manchester science festival
mean
rhombicuboctahedron
logo
binary
bubble bobble
sorting
football
wool
national lottery
frobel
error bars
weak imposition
tennis
oeis
weather station
preconditioning
fence posts
raspberry pi
noughts and crosses
partridge puzzle
pizza cutting
friendly squares
dates
bodmas
finite group
pac-man
crosswords
convergence
pi approximation day
alphabets
regular expressions
radio 4
folding paper
curvature
stirling numbers
inline code
pokémon wordle
graph theory
palindromes
nonograms
tetris
statistics
news
gerry anderson
recursion
estimation
european cup
accuracy
talking maths in public
anscombe's quartet
reuleaux polygons
flexagons
matrix of cofactors
martin gardner
cambridge
crochet
speed
probability
standard deviation
hannah fry
pascal's triangle
matrix of minors
simultaneous equations
london underground
game of life
asteroids
approximation
reddit
final fantasy
propositional calculus
wave scattering
crossnumbers
24 hour maths
go
golden ratio
programming
crossnumber
computational complexity
sport
mathsteroids
chess
london
fonts
phd
stickers
arrangement puzzles
runge's phenomenon
gaussian elimination
squares
rust
craft
bluesky
big internet math-off
kings
the aperiodical
live stream
guest posts
trigonometry
correlation
folding tube maps
bots
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