In this topic I will share information about the game with you.

1) GameObject (GO) spawning and editing

Press "I" in the default key settings to open the spawn menu. By pressing "I" you can also close the spawn menu.

There you have got four tabs: GameObjects, Parameters, Textures and Last Spawned

In the GameObjects tab you can click on the object you want to spawn.

In the Parameters tab you can edit many things of the selected GameObject in the GameObjects tab. These settings will then be applied to your spawned GO.

In the Textures panel you can edit the texture of the GO.

In the Last Spawned panel you can see the last spawned objects of you and edit their parameters or texture.

When you have the SpawnMenu closed you can also point at a spawned GO and edit its parameters by pressing "U". Then you need to click on apply to set these parameters. Closing this menu is done by the key "U" or "I".

2) creating and joining multiplayer games

By selecting "New Game" in the main menu and then choosing a scene and a username, by then starting the game you automatically create a multiplayer game with your instance as server. Other players only need to click on "Join Game" in the main menu and enter the server ip and their name. If you are in a local network and others are outside this network it can sometimes be that you have to unlock certain ports of your router. If you want to know how this works you can ask here in this thread.

The standard port for UnitySandbox is 19991 TCP and UDP.