Wikipedia.org
About sudoku game history, mathematics, tournaments and variants such as Killer, Hypersudoku, Jigsaw or others.
Online since: 2001-01-13 / Next review: 2025-03-11
Sudokuoftheday.com
Guide where you can learn about sudoku, how to start, learn basic techniques and advanced such as Swordfish or Nishio.
Online since: 2005-08-09 / Next review: 2025-08-10
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