What sort of devices? Will people really sit there logged into multiple devices, and expect them all to rise in realtime? I mean, wouldn't a user play on one device. Finish, and maybe pick up another device - and when they do, you refresh all the stats when the app loads? I would suggest you use RTT for real-time notifications - but we actually assume that that a user would only have one logged in RTT session - so that won't work. You could send push notifications to all of the devices. Push notifications can have data payloads - so your client app(s) can catch the updated data, or maybe the notification is just a signal to the client to request updated data... (likely more flexible). Alternatively, I guess your option best option would be to have the devices poll every <x> minutes or so... Honestly, the use case still seems a bit weird though - I'm probably just not understanding something Paul.

@Steve-Jones thanks dear Steve jobs (oops!) Jones . i found this after one day challenge with bomberRTT sample ! i think its better to say somewhere this important note that " developer plan" needed to lunch RTT games. p.n: i build this project in platforms pc / webgl / android in unity2019.1.5 pro. Android version not worked in my android phone (android9 os). something wrong that cause app install but not available to play!