A free app for Android, by Paridae.

The 50 US States Quiz is a free educational game that will help you learn all 50 states and their capital cities. The application consists of multiple levels, each one with a different amount of questions. The amount of questions will increase as you move forward, and when you reach the end of a level, you will be able to access the next one. At the end of each level, you will be able to access a ranking where you can see how you did compared to other players.

The application has been developed to help you learn, and the answers are provided in a simple and easy-to-understand format. The application is a kind of trivia game of the states of the US.