Sudoku is an old classic game that originated in the late 18th century,This classic Sudoku board game is good for formation of logical thinking. This puzzle game is based on numbers and colors and promotes the practice of logical thinking and reasoning.Built-in multiple game modes and corresponding reference answers can make children more challenging in the game. This is a fun game of observation and strategy filling! This is a diversified game, players can do various challenges according to the color or number of the pieces.