To deactivate the Tapped Out Notifications you need at least android 4.1. You can disable a notification by doing a long click on the notification and select "App info".
Scroll down for an android app, which you can use to manually "replace" the disturbing "Springfield Tapped Out" notifications with more decent ones.
You can also disable the Notifications by grabbing the Tapped Out Icon and drop it on "App Info" right next to "Uninstall".
Below you can see the workflow how to disable the notifications.
|Drag the icon to your "desktop"|
|Drop the icon on "App Info"|