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I did not find it clear that the first value of D is not to be used as a move direction. I suggest to improve on the description.
Maybe it should be moved to medium?
It should be moved to CoC instead.
Thanks for the feedback, I submitted it as a clash.
@nicola suggested to move the contribution to CoC instead of submitting the approved puzzle again as a clash?
There isn’t any way to move it like that. Anyhow, it is proving to be wildly popular (38 have solved it already) so it is looking to be valuable IP.