A free app for Android, by Math and Games Studio.

This puzzle game is designed for all ages, even kids and adults. You can choose between a variety of themes that will help you get started, such as animals, birds, insects, fruits, and vegetables. There are more than 100 different puzzles in the game, so you will not get bored quickly.

Once you have selected a theme, you can start by selecting a picture from the provided list of photos. You can select one of the different levels of difficulty, depending on your age and skills.

You will have the option of viewing the step by step process, which is very interesting to watch.