Within the frame of the blank , any number of 1-9 is entered.

 Number of 1-9 is entered one by one in any row, column , and box.

 

 There are nine rows line.

 The frame of the nine line , enter one of the digits from 1 to 9 in any.

 

 There are nine rows of columns.

 The frame of the nine line , enter one of the digits from 1 to 9 in any.

 

 Box is a frame of 3 × 3 which is surrounded by a thick line.

 The frame of nine box , enter one of the digits from 1 to 9 in any.

 Box There are nine.