(3 × 3) Korean Sudoku 유

This workbook is a 3*3 Korean Sudoku game. Look at the example below and make sure that horizontal/vertical characters (alphabets) do not overlap. Sudoku can develop thinking, memory, and problem solving skills. Teachers and parents explain the rules to their children. Also, raise the difficulty step by step. It is a quiz that you can easily solve problems by yourself. Then have fun.

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