Easy Sudoku 4x4 to 7x7 for Color Figures

Shin-chan's Easy SUDOKU 4x4,6x6,7x7 Do you want to strengthen your kid's thinking ability? Why don't you train your kids' head by doing puzzles with some Shin-chan and friends' pictures? That is the origin of the development of this application. I hope children would have fun playing with SUDOKU, train the brain, and acquire thinking skills. It also becomes a brain train of elderly people. There…