Coolson's Beta: A Word on Game Center.
Beta apps like Coolson's use a different, separate Game Center to the real one that apps from the App Store use. Apple calls it the "Sandbox" Game Center. You will need to create a Sandbox Game Center account when you first play Coolson's - it will prompt you. The Sandbox Game Center is entirely separate from the real one. You can use the same AppleID as you usually use, and hopefully your usual Game Center nickname will still be available in the Sandbox - if it's not, you'll need to choose another, I'm afraid!
An iPad can only be logged in to either the sandbox or the real Game Center. Launching Coolson's will automatically log you out of Game Center into Sandbox Game Center. Launching an App Store app that uses Game Center will log you out of the Sandbox Game Center and into Game Center. Launching the iPad's preinstalled "Game Center" app will not change which Game Center you're logged into; it will show the Sandbox if you previously played Coolson's, and the