2023-06-29 Thanks to Martin Ender (Menderbug) for help clarifying the rules, checking the uniqueness of the example puzzle and for suggesting the double-diagonal aux marks! 2023-07-08no-crossing variant added (Solyu). Thanks to Martin Ender (Menderbug) for finding a non-uniqueness, fixed 2023-09-06 Colouring different lines now active by default (thanks xian) 2024-02-06PinkHoodie brought Achtelwenden to the modern format today - thank you! 2024-02-09 In addition, the no-crossing variant panel was also made by PinkHoodie2024-07-27puzzlettersPinkHoodie sent 1 puzzle that originated the variant thats-not-right! 2025-01-19puzzlettersPinkHoodie shared 1 Achtelwenden (classic) puzzle, 16x6 - appreciated!