If you ask me, this is brilliant! Such a simple and fun activity for kids and even adults. Kristina, from School Time Snippets, explains how not only is this a great activity for the brain but also for the fine motor skills. If you aren’t sure how to play sudoku, the object is to fill in the cells of a grid without any duplicate colors (in this case) in each row or column. It was a great idea to use post-it notes because I have yet to finish a sudoku puzzle where I didn’t have to change up things up at least once.
Learn how to make your own simple sudoku game using paper, Post-It notes, and this tutorial.

Several countries have a day set aside to honor and recognize their inventors, but Nov. 9 is a special one that’s known as Tag der Erfinder in German. It’s celebrated in Germany, Austria and Switzerland and it falls on Nov. 9 because that’s the birthday of Hedy Lamarr.
This is a nice idea. I find that some kids have already seen and maybe even done some Sudoku puzzles already, so would be good to have something a bit harder for them!