Figment by Lumosity is currently only available for iOS devices.
You can download Figment for iOS here or by searching "Figment" in the App Store.
Please note: due to the size of the app, it's best to download and install when connected to a WiFi network.
If you have trouble installing the app, you may not have enough space on your device to download the app. Try uninstalling other apps that you're no longer using and deleting unnecessary files.
Having trouble with the app? Check out this troubleshooting article.