A REVIEW OF EASY SUDOKU

If you need to very clear a certain sq., Guantee that sq. is selected and it is in gentle blue. Click on/touch the eraser icon. If there is a number in that square, It will probably be taken out. For those who click/contact it all over again, any pencil marks in that square are going to be removed.Try to look for Grid Symmetry: Usually, Sudoku puzz