These Zipper lines, like most Zipper lines, are made up of pairs, with or without a center digit. Unlike most Zipper lines, each is one of a kind. Not just in which pairs make up the line’s value in which order, but in the values themselves.
Rules:
Normal Sudoku rules apply.
Pairs of digits an equal number of cells from the center of a line sum to the value of the line. If there is a center digit, it is the line’s value. Each line’s value is distinct.
Estimated difficulty: 2.5 out of 5
Solve on SudokuPad