A Sudoku With Only 4 Given Digits: 2025 Edition!

** TODAY'S PUZZLE **
With a title like that it could only be Aad van de Wetering! His new puzzle Squares And Primes Harmony showcases his style perfectly - an original and yet simple ruleset but some fasinating logic under the surface.

Play the puzzle at the links below:

https://sudokupad.app/qndcjysi43

Rules
Normal sudoku rules apply. The cells in the grid are numbered from 1 to 81 in normal reading order ie 1 at the upper left, ..., 9 at the upper right until 81 at the bottom right. The digit in a cell with a square number is itself a square (1,4,9) while the digit in a cell with prime number is a prime (2,3,5,7). In addition, any vertical or horizontal straight line of three cells never contains a consecutive set of digits.

** NUMBERPHILE VIDEO **
There is a new @numberphile video featuring Cracking The Cryptic. Thanks so much to Brady Haran. You can find it here:
   • The Anti-Knight Killer Sudoku - Numberphile  

** BLUE PRINCE STREAM **
You can rewatch last night's Blue Prince stream here:

https://youtube.com/live/EYk5kLzKSp0

▶ NEW PATREON VIDEOS ◀
We've started releasing solution videos for this month's Skunkwork's competition. We will draw the winner in the next couple of days.

  / crackingthecryptic  

** LIVE CRACKING THE CRYPTIC SHOW **
On 2nd November Simon & Mark will be doing a live episode at the Stratford-upon-Avon Literary Festival.
https://www.stratfordliteraryfestival...

▶NEW SUDOKU WORMS NOW LIVE! ◀
We're delighted to announce the release of two new worms - by none other than Phistomefel and Michael Lefkowitz (Juggler)! These join the first two worms by Marty Sears or James Sinclair... you can find them either on Steam at these addresses or on AppStore:
Steam:
https://store.steampowered.com/app/40...
https://store.steampowered.com/app/40... https://store.steampowered.com/app/37...
https://store.steampowered.com/app/37...
AppStore https://apps.apple.com/us/app/crackin...
Android: https://play.google.com/store/apps/de...
and our latest full app is Cracking the Cryptic’s Fog-of-War Sudoku!
All our apps can be found at our website with links to all outlets:
https://www.crackingthecryptic.com/apps

▶ SVEN’S SUDOKU PAD ◀
Input classic sudoku puzzles into our software. With 12 free puzzles:
iOS: https://apps.apple.com/us/app/svens-s...
Steam: https://store.steampowered.com/app/17...
Android: https://play.google.com/store/apps/de...
Amazon: Search for “SudokuPad”

▶ CTC FAN DISCORD SERVER◀
  / discord  

▶ OUR VIDEO CATALOGUE – CATEGORISED WITH LINKS◀
https://tinyurl.com/CTCCatalogue

▶SEND US PUZZLES TO SOLVE/CONTACT US◀
[email protected]
Snailmail: Mark Goodliffe, Box 102, 56 Gloucester Road, London SW7 4UB

▶FOLLOW US◀
Twitter: #crypticcracking
@crypticcracking
Instagram @crackingthecryptic

▶Credits◀
Music: Lucy Audrin (Piano): Mozart's Sonata no 16; and Mark’s outro music by Riffclown.
SOFTWARE: Thanks to Sam Cappleman-Lynes and Sven Neumann
Logo: Melvyn Mainini
Opening Credits: Burak Mescioğlu

▶ Contents Of This Video ◀

0:00 Intro music and puzzle introduction
1:42 Stratford On Sunday
2:18 Blue Prince
2:32 Patreon news
2:58 Happy Birthday
4:28 Rules
6:10 Start of Solve: Let's Get Cracking

#sudoku #puzzle #maths