Jandisoft has published a short video demonstrating cross-platform play on PC and mobile devices in the MMORPG Mad World. As you can see, the player simultaneously controls the character on two platforms. The interface on a smartphone is also visible.
It is worth noting that in the future the authors plan to expand the number of available devices by adding the game to Steam, Facebook and releasing it on consoles.
Mad World is a free-to-play, cross-platform, isometric 2D browser-based MMORPG available in the browser or when running the client on PC and iOS and Android mobile devices. The project was developed by Jandsoft studio from Asia based on HTML5.