I was experimenting with something of a Palindromic Loop, but ran out of time, so gave it up and just went for an almost-connect-structure. I think because of the size of the Palindrome, this may be harder than the rating, just considering keeping track of the equalities. But, logically, I don’t think its too tricky.
Rules – Follow regular Sudoku rules. The numbers formed by the digits on the gray lines are palindromes, that is to say, they can be read equally in both directions.
Rated – Medium.