F-Puzzles - https://f-puzzles.com/?id=yuy8dwbs
CtC - https://tinyurl.com/27k5cuye
Solution code: R5 and C5 (no spaces)
on 13. October 2023, 02:52 by joshfrew
CTC link fixed
on 12. October 2023, 14:35 by dmarcucci
The CTC link has expired.
on 1. October 2023, 23:41 by Flinty
The sort of constraint that once you break it, it gets exponentially easier - haha. Thank you. :)
on 1. October 2023, 20:32 by zalak_lab
Wonderful puzzle.I wonder how you are creating such fine puzzles.
on 1. October 2023, 15:13 by Ragna
Fun puzzle. Very tricky. Thank you for sharing. :-)