quadcopter
(Published on 28. January 2026, 09:50 by arctan)
normal sudoku rules apply.
digits may not repeat along either diagonal.
digits along an arrow sum up to the digit in the arrow's circle.
if two digits are adjacent on a black line, then one digit is double the other.
if two digits are adjacent on a magenta line, then they are consecutive.
the grid is covered in fog; placing correct digits will clear the fog in that cell, and may also clear fog in other cells. no guessing is necessary to solve the puzzle.
Solution code: row five, left to right
Comments
today, 03:00 by MikeMeech
Astonishing break in, and a few more interesting deductions to get it to come together!
yesterday, 19:02 by arctan
added link to ctc solve
yesterday, 09:17 by QuiltyAsCharged
Such lovely logic, bravo!
on 29. January 2026, 17:56 by Snookerfan
Very impressive puzzle! The break-in made sense to me when I discovered it, but I am still not 100% sure I have proven it to be right, although it did solve the puzzle. Thanks
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thanks for the solve and the comment! posting a hidden comment with my thoughts on the break-in, and hopefully that cements your proof
Later yesterday while whatching tv (snooker actually :)), I kept thinking about it and found my proof and it was exactly what you intended. Sometimes I have to think a bit simpler. Great break-in!
on 28. January 2026, 17:37 by jwsinclair
Enjoyed this a lot :)
