How do you play?

Popdoku is easy to play game similar to Sudoku. Just click in a square to select your first number, then click a second square to switch them. Like Sudoku, Popdoku requires no math skills. It is a fun logical puzzle

Popdoku has only one rule: Fill in the game board so that the numbers 1 through 9 occur exactly once in each row, column, and 3x3 square. Each number may appear in any order. Your starting game board will have several numbers that are already there. Those numbers may not be changed. Your goal is to switch the other numbers following the simple rule.