When you visit the main page for the first time, you only see the door leading North. If you visit again (and not delete your information), you will see two more doors (well, doormats) leading East and South. But there are also several invisible spots (sometimes referred as floortiles or trapdoors), that can be clicked. They can actually be seen, if you apply Seer of Void like this: http://farragofiction.com/ZampanioSim/?seerOfVoid=true
One of them leads West, the others lead to several places, often different depending on day and time, these are the ones collected here.
~The Watcher of Threads