How do I move app and game program (APK + OBB) files from the SHIELD TABLET's internal storage to the microsd card?
Move data files by going to Settings → Apps → (Select App) → Move to SD card
NOTES:
The ability to move data to SD card is variable for select apps and games. Only apps that developers have opted in as moveable to external storage can be moved.
The SHIELD tablet only supports writing to FAT32 and NTFS formatted cards.
64 GB (or higher) microSD cards – Android does not support the exFAT file system out-of-the-box. Because the standard FAT32 file system does NOT support partitions greater than 32 GB by default, 64 GB cards come pre-formatted as exFAT. If you want to use a 64 GB microSD with the SHIELD tablet, it has to be converted to a file system format that is supported by stock Android, which in this case is NTFS. This can be done using a PC.
Android KitKat significantly changes the way applications are allowed to use SD cards. If you use SD Card to store data, please read here for further details.
Doesn't say games cannot be moved only that apps have to be developed as moveable?
http://shield.nvidia.com/tablet-faq/