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Get the indicated amount of stars to unlock the corresponding skill challenge puzzles which are timed random puzzles based on your skill level. Stars are earned on how fast you finish the puzzles in Play mode.
Rookie Get 30 stars
Beginner - Get 40 stars
Amateur - Get 70 stars
Mania Get 100 stars
Veteran Get 130 stars
Semipro Get 180 stars
Pro Get 230 stars
Expert - Get 300 stars
Specialist Get 450 stars
Sudoku Master Get 650 stars