We don't recommend having more than one game account per device.

If you try to add another account (e.g. for your relative) by connecting the game to a different Facebook page or Google account, your own progress may be irretrievably lost. This action may also lead to mixing your and your relative's progress.

In order to avoid this kind of issue, we strongly suggest that you and your friends or family members play Mystery Matters each on their own device.