I have checked the official website and the App Store for iPads, but the game doesn't appear anymore. However, if you have purchased it in the past, then log in with that account used to purchase the application on the new iPad and the app should appear as being available for installation. This seems to be the only way in case you want to transfer the game to another device.
Use the App Store and search the application. It should be available in the cloud and ready to be installed.