A free app for Android, by Sudoku King.
Have you ever had the feeling of a missing piece in your puzzle? Have you ever gotten stuck and not been able to figure out what's wrong? Have you ever tried to solve a puzzle but had no idea how to do it? If you have, you're not alone. In fact, this problem is so common that there are lots of ways to solve it. The most effective way is to simply take a paper and a pencil and start drawing. The objective is to fill in all the numbers so that you can get to the next number. It's a great way to relax and get your brain working.
