Logic Masters Deutschland e.V.

Tenable, by James Sinclair

Fill each row, column, and box with the digits 0-9 once each. Exactly one cell in each row, column, and box is a "Schrödinger's cell", containing two digits at once.
A cell's value is equal to the sum of its digits.
Divide each line into one or more segments containing values that sum to a (non-zero) multiple of 10, so that every cell on a line is part of exactly one segment.
A value in a circle indicates the number of segments on its line (for counting purposes, lines are divided into the smallest possible increments, e.g. a 1-9-2-8 sequence is considered two segments, not one).
Values in cells with inequality signs are greater than the values in all orthogonally adjacent cells.

SudokuPad

If you want a more conventional ten lines puzzle, check out Au Gratin, the fifth puzzle in Artisanal Sudoku, Volume 180, which, like all previous multiples of 45, is a special edition with bonus puzzles and hints for all :)