A free app for Android, by Apollo Game Studio.
The free game is for kids, but adults can also play.
How to play:
The goal is to complete the level by connecting all of the pieces and then sliding them into their correct place on the board. There is a hint system that will help you if you get stuck. You can also use the hint system to get a better idea of what you need to do.
You can complete a level by placing the pieces in their right positions and have all the pieces fit together in the box.