Board Thread:Questions and Answers/@comment-26044650-20151130173041/@comment-26044650-20160106171945

Reversion wrote: It just means it will log out of your old account. Your Line account will still be saved (if you have an email on Line). Just that when you log into a new device, the Line on the old device will be logged out.

Edit: You also don't need line to be installed to play Cookie Run. I think that's how others play on 2 devices- by signing on with email on Cookie Run. Thanks for the clarification. I'm now able to play Cookie Run on both devices and I still have everything. :3