As part of promoting and improving pattern discovery skills among school children, a Sudoku puzzle can be used as example of a problem solving task. A simplified version of the puzzle will be used first to explain the aim and reinforce the rules of solving the puzzle. Three strategies--"Strategy of Obvious Missing Number, Strategy of Elimination", and "Strategy of Either This or That"--will then be introduced and applied in solving a simplified Sudoku puzzle that is appropriate for children in grades 4 to 6.