This ppt shows your students step by step strategies for solving Sudoku puzzles. These puzzles are excellent for teaching deductive reasoning! My enrichment students were thrilled to be able to do these "grown up" puzzles and begged for more. As a resource, Sudoku is great for a sponge activity. I recommend solving several Sudoku puzzles together before turning young students loose. It seems the hardest lesson for them to learn is not to guess.
Younger students may enjoy doing these Latin Square activities:
Please visit my blog