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ja Compete in timed challenges to test your skills.. Many people find Sudoku to be a relaxing and meditative activity..

Start with the easiest cells that have only one possible number.. Unique rectangles can help eliminate certain candidates..

ja The goal of Sudoku is to fill a 9x9 grid so that each row, column, and 3x3 box contains digits 1-9.. From newspapers to smartphones, Sudoku has adapted to every medium..

ja - The key to Sudoku mastery is consistent practice and learning new techniques..

Coloring techniques help visualize chains of related cells.. ja Many Sudoku apps offer daily challenges to keep players engaged..

Sudoku variants add exciting new rules to the classic format.. ja Sudoku variants like Killer Sudoku add mathematical elements to the puzzle..

ja Swordfish is an extension of X-wing involving three rows and columns..