Enneaglyphs is a version of sudoku. As the line zigzags, the numbers 1 - 9 follow in the correct sequence. However, you can't tell which is the head & which is the tail. Of course the middle # must be 5.
I've gotten tired of sudoku - even the variations. But maybe you have not.
Enneaglyphs is a free puzzle app. Try it.
Thank you for highlighting Enneaglyphs here! I didn't know this blog existed until today. Now I'm going to have to browse the archives for apps to try...
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