In another puzzle, blue lines might suggest water, or a serene sky, but I can’t help but think of them here as shards of glass. Be careful!
Rules:
Normal Sudoku rules apply.
Region Sum Lines: Thick region borders divide each line into segments on which the digits have the same sum. Different lines may have different sums.
Estimated Difficulty: 1.5 out of 5
Solve on SudokuPad