Rules -- Crowd Nine

This puzzle, also known as Sudoku, is often thought of as a Japanese puzzle craze; however, the puzzle was actually invented by Dell Magazines (under the name Number Place), an American company, and was adopted by the Japanese puzzle company Nikoli later.

1. Place a single digit from 1 through 9 in every empty cell so that every row, column, and outlined box consisting of nine cells each contains every digit from 1 through 9 exactly once.