The rules to Easy Valentine's Day Sudoku are simple. Let's start with the board. The Sudoku board consists of nine columns and nine rows. Within that there are also nine 3x3 squares. Fill each empty square on the sudoku board with the numbers one through nine. Each 3x3 square, row, and column can contain the number 1, 2, 3, 4, 5, 6, 7, 8, and 9 only once. If you enter the wrong number in a square on the sudoku board than you will be penalized by having time added to the timer at the bottom left corner of the Valentine's Day Sudoku board.. Sudoku Rules. Sudoku is a number puzzle where the objective is to fill every row, column and box (3x3 grid) with the numbers from 1-9. Each unit (row, column or box) must have each number exactly once. The game starts with a number of fields pre-filled. Your objective is to fill the rest of the fields without breaking the constraints. Falling in love with Valentine's Day Sudoku is, well, Easy! This online sudoku game is no funny valentine, answers are straightforward and abundant. Easy Valentine's Day Sudoku is easier than the sudoku games of higher difficulty on the Valentine's Day Sudoku site because less strategic play is required..