There is at least one Sudoku or Puzzle Competition held every week across the world. The good news is that to participate in most of these competitions, one doesn't need to travel anywhere. If someone has an internet connection and a printer, he/she can participate in these championships online, sitting at home.
Earlier, we used to list these championships every week. However, this practice stopped in the year 2016. However, here is the list of all these championships.
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