Design: Randall Montanari
It's been almost a year since The Elder Scrolls: Oblivion launched its way onto our Xbox 360's and PCs. It immediately garnered significant critical acclaim, and wound up winning GameSpot's award for Best RPG of 2006. Since it's been released, though, it's also been the subject of plenty of modifications, both from its fan community and from its developers. While some of the addons were seemingly designed solely to annoy people (hello, horse armor!) there were also plenty of new and meaningful additions to the game, including an entirely new faction with new quests to complete.
Now, though, Bethesda has released the first full-fledged expansion to Oblivion, and it's available for download over Xbox Live or on PC; you can also buy a boxed retail copy of it, as well. In it, a portal opens up in Cyrodiil, where Oblivion takes place, and leads you into the Shivering Isles, a land that's run by the god of madness, Sheogorath. He's worried about an impending invasion by the forces of order, and asks you to help him break out of a cycle that's been reoccuring for millenia.
GameSpot's Game Guide to Shivering Isles will guide you through the main quest of the game. Enjoy!