Cross-device game saves My father loves the game Hay Day. I'm not exactly sure why but that isn't important. 

He is on a Motorola Droid Ultra and the Ellipsis 7 tablet he recently got for free at Verizon for upgrading. Both running some version or another of Jelly Bean. 

He doesn't want to transfer the data from his phone to his tablet, he wants to sync the games. He won't be playing them both at the same time. But I was just wondering, if that is a possibility. 

Summing up, I guess I'm asking, if we can backup and download save data seamlessly. I'm not a programmer but I'm absolutely not a newbie.
Cross device save as explained by Boggartfly, is to be enabled by the game developer to use Google Play Services. 

However, if the game does not support the feature, you can always sync the game's data saved in /data folder of Android across the devices. Unfortunately, that tends to be a root-only option, since reading/writing from/to /data folder requires root access. 

If you are willing to root your device, DataSync allows syncing of data across devices over WiFi/Bluetooth/Google Drive/DropBox/NFC. It is easy to use once you have understood the mechanics of it. 

This applies to all the applications on your devices not just to games.