A free program for Android, by EasyFun Game.

Hoop Sort – Color Ring Puzzle is a simple and addicting game. You will find yourself having a lot of fun. It is a color sorting game, which means that you will have to match colors and sort them in a certain order. If you’re feeling really good, you can even try to get a higher score. The more you play, the more you will get better at it. 

It’s a simple game, which means that it is not that difficult to get the hang of it. So don’t be afraid to give it a try. You will not be disappointed.