Uploaded October 2025 | Updated September 2026, 3 weeks ago

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A "killer sudoku" with a stroke of genius... Learn for free on Brilliant (and get 20% off a premium subscription) at brilliant.org/numberphile (episode sponsor). More links & stuff in full description below ↓↓↓

This video features Simon Anthony from Cracking the Cryptic.

Try the puzzle yourself here - https://sudokupad.app/FmTJm94bMR
Watch Simon tackle the puzzle on Cracking the Cryptic - youtube.com/watch?v=wps4c6WZKeM

Catch Simon's previous video about the Phistomephel Ring - youtu.be/pezlnN4X52g

Cracking the Cryptic - youtube.com/c/CrackingTheCryptic

Cracking the Cryptic on Numberphile - youtube.com/playlist?list=PLt5AfwLFPxWKtlMAE1n0JbiBMqSH2VMH4

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