The Hub explains it this way: hosting a game requires a laptop or desktop computer with a modern web browser. Mobile devices, iPads and Chromebooks cannot host a game, because they do not support running the game's Host Console and Heads Up Display (HUD) in separate windows. These devices can still join as players on already running games.
#What you can do
| Device | What it can do |
|---|---|
| Laptop or desktop computer | Start and host games. Shows the Host Console and the HUD in separate windows. |
| Phone | Join games as a player. |
| Tablet or iPad | Join games as a player. Because a tablet cannot share its screen to a TV, use a computer for the HUD. Once a game is running, a tablet can also open the same Host Console, as a second controller, so you can move around the room while you host. |
| Chromebook | Join games as a player. |