I found this video recently.
I made a multiplayer game for my undergraduate thesis in 2014 for Game Production with Unity.
It was a server (PC) that we could connect by cell phone and play Quizes in two environments (basket and archery).
The interesting was the ability to integrate the mobile with the PC: we threw the ball and the arrow in the mobile and they appeared on the PC. You could change the directions, force, and angle you throw them in the first version.