mscroggs.co.uk
mscroggs.co.uk

subscribe

Comment

Comments

Comments in green were written by me. Comments in blue were not written by me.
Could I have some help with puzzle 23. I don't see anything about a 3×3 block. How to arrive at a formula for the number of squares that need colouring?
Reza
on /blog/111
               
@Reza: I think he reworded it. As for how to solve it, I didn't find a formula or anything. I just basically used his 5x5 example and extrapolated it. It's much less complex than you think it'll be.
Seth Cohen
on /blog/111
   ×1            
@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
               

Archive

Show me a random blog post
 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 ▼
 2022 
▼ show ▼
 2021 
▼ show ▼
 2020 
▼ show ▼
 2019 
▼ show ▼
 2018 
▼ show ▼
 2017 
▼ show ▼
 2016 
▼ show ▼
 2015 
▼ show ▼
 2014 
▼ show ▼
 2013 
▼ show ▼
 2012 
▼ show ▼

Tags

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

Archive

Show me a random blog post
▼ show ▼
© Matthew Scroggs 2012–2026