Cat King Sudoku - Free Sudoku

Sudoku originated from the Latin square matrix studied by Swiss mathematician Euler and others in the early 18th century. In China, first-year students began to learn Sudoku, using "unique method" and "exclusion method" to solve Sudoku puzzles and train logic thinking ability. Cat King Sudoku provides Sudoku with a variety of levels of difficulty, from 4th, 6th, 8th to 9th, from beginner, easy to expert and master, suitable for students and Sudoku lovers of different ages. FEATURES: - 4x4, 6x6, 8x8, 9x9, a variety of classic Sudoku gameplay - three game modes - six different difficulties - unlimited levels in random mode - hundreds of puzzles to explore in levels mode - daily challenge mode, train your brain every day - hint system for beginners - pencil marks feature for solving hard puzzles - auto-note feature - auto-save your progress for each puzzle - pause anytime, resume anytime - phones and tablets support - leaderboard feature - daily login rewards