You're in luck, because they're revamped it all to be more easily readable/viewable on mobile devices, and they're moving stuff to HTML5 and YouTube links instead of only having Flash (you can still view the original Flash if you want, from an appropriate browser). It's Homestuck.com now.
What you need to know is that it's basically a dream/thought space created from the memories of a dead player, and can be influenced by the memories of a living player passing through it. It's very similar to the encephalon concepts.
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Here's an explanation from the wiki: Dream bubble
What you need to know is that it's basically a dream/thought space created from the memories of a dead player, and can be influenced by the memories of a living player passing through it. It's very similar to the encephalon concepts.