A free program for Android, by Egemen Can Uze.

The free app is perfect for anyone looking to learn German in a fun and intuitive way. It provides you with a series of challenges to complete, as well as word games to play. The best part is that you can use the app as often as you like, to help you learn German in a fast and effective way.

The basic structure of the app is as follows:

You will first be given a series of challenges. You will need to find the answer to the questions, and if you are successful, you will be given a score and a chance to repeat the challenge.