Multiplayer: check

After a week of creative Messing About™ with unity tutorials and network code, I've made a game that can host games and request a list of all available games of that type, and join it. As soon as it joins, it calls a function on all clients that for now just outputs Hello World. In the future, though, that can be "load a level" or anything else we want. Essentially, we have a framework for multiplayer! \o/