Sudoku
DIFFICULTY: MEDIUM The rules are simple: Enter digits from 1 to 9 into the blank spaces. Every row must have one of each digit, as must every column, and every 3-by-3 square.
DIFFICULTY: MEDIUM The rules are simple: Enter digits from 1 to 9 into the blank spaces. Every row must have one of each digit, as must every column, and every 3-by-3 square.