The 10 OAPC Championships were conducted in the year 2009. You don't need to travel anywhere to participate in these puzzle competitions; you can participate from your home, as these championships were conducted online. There were many new puzzle variations were introduced in these championships. I have created many of these puzzles that were newly introduced in this championship. Most of these puzzles are published on this website. Most of these newly introduced puzzles were part of the World Puzzle Championship, which took place in Turkey in the same year. The last 10th OAPC competition was part of the WPC, which one could participate in online sitting at home.
You can practice such puzzles on this website: the Sudoku Variations Main Page or Conceptis Puzzles Online. Moreover, you can solve many Fun Brain Teasers to challenge your brain.
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