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Comments in green were written by me. Comments in blue were not written by me.
2025-12-24
@
Chad
: What was your wrong answer for #15? I had that one wrong too at first, and it took a kind of sneaky "Oh of course!" insight for me to figure it out.
Seth Cohen
on
/blog/120
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A bad Puzzle for Today
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Assorted christmaths
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"Uncanny" royal coincidence
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Archive
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Feb 2026
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Nov 2025
Christmas (2025) is coming!
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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
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2023
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Christmas (2023) is coming!
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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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Christmas (2022) is over
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▼ 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
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Nov 2021
Christmas (2021) is coming!
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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 -1+π 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
football
machine learning
martin gardner
stickers
reddit
phd
game of life
warwick
data
friendly squares
convergence
approximation
dragon curves
fence posts
alphabets
simultaneous equations
curvature
pokémon
flexagons
geometry
national lottery
cambridge
kenilworth
gather town
wool
crosswords
fractals
numerical analysis
people maths
thirteen
weak imposition
probability
talking maths in public
ucl
polynomials
crossnumbers
tennis
edinburgh
fonts
palindromes
london
runge's phenomenon
inverse matrices
news
pac-man
golden ratio
accuracy
a gamut of games
statistics
bodmas
kings
squares
london underground
turtles
games
big internet math-off
video games
dataset
tetris
go
books
frobel
hexapawn
european cup
pascal's triangle
sorting
databet
propositional calculus
matrix multiplication
royal institution
determinants
royal baby
errors
php
matrices
24 hour maths
graphs
golden spiral
logic
pizza cutting
harriss spiral
matt parker
draughts
weather station
plastic ratio
crochet
error bars
datasaurus dozen
the aperiodical
manchester
mean
javascript
zines
programming
hannah fry
logs
youtube
data visualisation
exponential growth
christmas card
sobolev spaces
matrix of minors
oeis
chebyshev
electromagnetic field
game show probability
finite group
pi
inline code
rhombicuboctahedron
realhats
speed
gerry anderson
pythagoras
latex
map projections
logo
rugby
arithmetic
signorini conditions
regular expressions
tmip
ternary
quadrilaterals
folding tube maps
final fantasy
coins
bluesky
binary
pi approximation day
hats
world cup
dinosaurs
python
radio 4
interpolation
live stream
mathslogicbot
cross stitch
pokémon wordle
mathsteroids
reuleaux polygons
sound
hyperbolic surfaces
chess
folding paper
triangles
chalkdust magazine
stirling numbers
gaussian elimination
captain scarlet
rust
recursion
trigonometry
christmas
anscombe's quartet
standard deviation
guest posts
misleading statistics
bubble bobble
graph theory
matrix of cofactors
noughts and crosses
menace
asteroids
braiding
bots
correlation
craft
dates
raspberry pi
numbers
bempp
nine men's morris
manchester science festival
light
wave scattering
estimation
crossnumber
computational complexity
advent calendar
preconditioning
puzzles
platonic solids
mathsjam
boundary element methods
arrangement puzzles
partridge puzzle
coventry
wordle
finite element method
newcastle
countdown
nonograms
sport
geogebra
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