CTC12tone
12tone has one puzzle in the Variant Sudoku catalog, most often with Extra Regions, Parity Lines and Pathway. One was solved on Cracking the Cryptic. Every puzzle below links to its original home, so the setter gets the credit and the traffic.
Puzzles here1All 9×9
First puzzle2025Snake Egg Sudoku
Latest puzzleDec 2025Snake Egg Sudoku
On Cracking the Cryptic1video
On Variant Sudoku
Favourite rules
Puzzles by 12tone
Newest first. “Play here” opens the puzzle in Variant Sudoku, loaded live from the setter’s own link.
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