Board Thread:Questions and Answers/@comment-33322094-20171010204757/@comment-24577221-20171010212928

It shouldn't be.

All of the actual game data is saved on the BBB servers. If you play with an E-mail account, that account tells the game server which is your game ID. If you play with a "Guest" account / "anonymous" account, what's saved on your computer or phone is one or two small files that do the same thing: tell the game server which is your game ID.

This is why it's easy to play the "same" game on multiple devices, just by giving your E-mail account. To do the same kind of thing with a "Guest"/"anonymous" account, you would have to copy the game files between the devices. But the two kinds of game ID shouldn't interact.