The Planet System upgrades have been completed. Players will now be able to select up to 10 levels to apply to a building at once. To upgrade your buildings simply click on the Upgrade dropdown list and select the amount of levels you wish to upgrade. Clicking on an amount of levels will immediately apply that many levels to your planet. If you click on it but do not wish to upgrade that building then you can click outside of the dropdown list area to close it or click on the Upgrade option it provides.