"Stack the States" is available for Android devices in the Google Play Store and in the Amazon.com Appstore, as of 2015. This app has a free trial version and a paid full version available.
"Stack the States" is an educational app that is compatible with both phone and tablet Android devices, and is also compatible with Apple devices. This app teaches children state facts through interactive game play. When a kid correctly answers questions about a state, she earns that state in the game. As the player collects states, the states stack on top of each other. In order to win, the player must stack the states up to a checkered line on the screen.