If You Make A Sudoku Mistake, How Can You Fix It?

** TODAY'S PUZZLE **
A work of art this evening from Miky. This is one of the most beautiful grids we've seen with an astonishing pinwheel construction that yields some incredible logic. Now a confession: Simon makes a small pencil-marking error at one point (a card pops up at that moment) but he does realise it later on and fix it.
Some of you want to know how you unpick an error - well this video is a good example. It is critical to a) find the error and b) trace through any logical steps after that error to understand what you can and can't rely on from any logic you deduced following the error. Let us know how you think Simon did.
Play the puzzle at the following link:
sudokupad.app/sj0yv59u4t
Rules:
Normal sudoku rules apply. Golden lines form sets of non-repeating digits where no digits can be consecutive. Cells with grey circles contain odd digits; cells with grey squares contain even digits.
** OUR DECEMBER COMPETITION & SIMON'S BONUS SOLVES **
100 4x4 Snackdoku pack from the Skunkworks was released on 1 December as our monthly reward.
Simon's solve of Broken Secrets by TotallyNormalCat was also released yesterday. You can try that puzzle here: sudokupad.app/jMg44R2tpb
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** KICKSTARTER LAUNCHED - FOG OF WAR **
Check out our new Kickstarter where we tasked ourselves with creating the best Xmas present for a puzzle fan. Phistomefel is making a puzzle for it!
www.kickstarter.com/projects/...
** ORDER OUR NEW BOOK AT THIS LINK **
If you would like to get hold of a physical copy of our new book, Cracking The Cryptic's Greatest Hits - Volume 2, there is still a chance. Visit the link below:
bean-games.pledgemanager.com/...
** NEW GAS PACK: VOLUME 2 IS OUT **
The new GAS (Genuinely Approachable Sudoku) pack is out on all platforms here:
play.google.com/store/apps/de...
store.steampowered.com/app/23...
apps.apple.com/us/app/crackin...
60 original puzzles by Clover, Bill Murphy and Philip Newman!! Earn party hats and dinosaurs with these brand new puzzles!
▶ SUDOKU PAD - Use Our Software For Your Puzzles ◀
You can input classic sudoku puzzles into our software and help support Sven, the programmer responsible for the wonderful user interface we all use to play these puzzles everyday. The app also comes with 12 handmade puzzles from us:
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Steam: store.steampowered.com/app/17...
Android:
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ALSO on Amazon: Search for “SudokuPad”
▶ Contents Of This Video ◀
0:00 Theme music & puzzle Intro
1:58 Chants of Sennaar
2:21 Kickstarter news
2:38 The 100 Snackdoku Christmas Present
3:33 Simon solves TotallyNormalCat
3:48 Happy Birthdays & Get Well Soon
6:05 Rules
7:25 Start of Solve: Let's Get Cracking
▶ Contact Us ◀
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Simon Anthony & Mark Goodliffe
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56 Gloucester Road
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