[Update Jan 2017] Google stopped hosting links from Google Drive a while ago, so this post is basically useless now.
[UPDATE: Dec ’14] Hosting Unity games on Google Drive has recently stopped working (at least for me). Even when I follow Google’s new instructions for getting the hosting link, Unity games don’t load from Google Drive. This includes games that were previously hosted and used to work. So I’m afraid it is no longer possible to rely on Google Drive to host Unity games. Your mileage may vary.
[Update: Jan ’14] It seems Google thought it would be a good idea to change Google Drive’s interface a little bit. So I updated the tutorial to match the new interface.
In this tutorial, I’ll show you how to host a game made with Unity3D on Google Drive. This tutorial assumes you know what the Unity Web Player is. I have seen a few results on how to host a Unity web-game from Dropbox, but I personally couldn’t find one about hosting from Google Drive. I wanted to host a Unity3D game from Google Drive to present to the Ludum Dare game dev competition.