Logic Masters Deutschland e.V.

Rules:

Normal Sudoku rules apply.

Draw nine non-branching orthogonal paths (lines connecting cell centers horizontally or vertically). Each path N (for N = 1 to 9) starts in one cell with digit N and ends in a different cell with digit N. Each path makes exactly N turns.

Paths turn only when entering a cell with a given diagonal line and cannot pass straight through those cells. Paths cannot start or end in a diagonal-line cell.

Paths may cross each other anywhere except at the starting or ending cells of any path (including their own). For paths 7, 8, and 9, the sequence of digits along the path (from start to end) forms a palindrome.

You can play this puzzle on Penpa+ using the following link. Answer check is triggered if you fill in all digits in the grid in green.

Penpa+