If you see the following pop up while testing your game:
Do not panic! This just a friendly warning from the Skillz SDK letting you know that you are currently on the Sandbox environment. This an environment that is exclusively for testing your game before release.
If you are in process of submitting the game and see this warning please STOP and verify that you have the correct environment set in your code. The implementation of setting the environment will vary depending on your platform, but for more details please refer to the following articles: