The current version of Game Locations has been tested on WP 3.8 with the Twentyeleven theme. If you use older version of WordPress, good luck! If you are using a newer version, please let me know how the plugin works, especially if you encounter problems.
Upgrading to this version of Game Locations should not impact any existing locations, however move any customizations made to the plugin stylesheet, because IT WILL BE OVERWRITTEN. (Always backup your WP database before you upgrade, just in case. 🙂