"There is really only one rule to Sudoku: Fill in the game board so that the numbers 1 through 9 occur exactly once in each row, column, and 3x3 box. The numbers can appear in any order and diagonals are not considered. Your initial game board will consist of several numbers that are already placed. Those numbers cannot be changed. Your goal is to fill in the empty squares following the simple rule above." -- Sudoku.com
Just solve the puzzle below and fill in the numbers that are in the colored boxes from left to right, top to bottom (left top, middle top, right top, left middle, middle, right middle, left bottom, middle bottom, right bottom).
Answer: all lowercase with no spaces. (ex. 123456789)
