Chronos (Dutch Flat Mates, Clock Faces)
(Published on 14. August 2025, 11:40 by Crusader175)
Rules:
Normal sudoku rules apply.
Dutch Flat Mates: Every 5 in the grid must have a 1 directly above it or a 9 directly below it. It may have both, but it doesn't need both.
Clock Faces: Four digits around a circle are placed in an increasing order starting from one of the four cells and going clockwise (white circle) or going anticlockwise (black circle).
X Pairs: Cells separated by an X sum to 10. Not all X's are given.
Puzzle Link: SudokuPad
Puzzle Hint: Clock Faces Guide
My youtube channel on solving sudoku: Crusader Puzzle
Solution code: Row 7
Comments
on 1. December 2025, 23:22 by Qodec
Wow, really well set. Thanks for sharing!
Reply: Thank you so much Qodec! I might make another puzzle with this variants.
on 15. August 2025, 16:44 by yusuf17
I solved it by noticing a pattern, but without actually proving that the pattern is the only way the digits can be arranged.
So, Simon would not approve, I guess.
But a very nice puzzle.
Reply: I put the clock faces logic explanation in the hidden comment. Thank you for solving! (The document has been updated and I decided to make it publicly available)
on 15. August 2025, 16:44 by da-hans
This is a very nice special episode to the DFM series. Not that difficult once you understand the constraint.
Reply: Thank you da-hans! I tried to make it not too difficult, focusing on showcasing the clock faces logic and the interaction with DFM.
