Logic Masters Deutschland e.V.

Echoes is a variant Sudoku using Echo Lines.

Sudoku:
Place the digits 1–9 in every row, column, and 3×3 box, with no repeats.

Echo Lines:
The absolute differences between consecutive digits along each purple line must form a palindrome.
For example, on a five-cell Echo Line, the consecutive differences could be 1, 3, 3, 1 or 2, 4, 4, 2.

Play online:
Solve in SudokuPad

I hope you enjoy it!

More puzzles by me can be found at UncleLogic.com.