Can I play my game on 2 devices, such as my phone and a tablet without losing my coins and boosters?
Yes, but only if you link them to Facebook or Apple ID [both probably has to be Apple devices as well]. Otherwise, you will have to start over whenever you get a new/update a device. Once linked, you will go to MENU [top left of game] > ACCOUNT
I have an Android phone and an iPad and I play on both devices. You can’t play the game on both devices at the same time.