Megabyte's Fortress was the lair of Megabyte after being resurrected by The Sourcerer. It was formerly a medieval castle in a mobile fortress command game that became corupted after megabyte stormed the castle. After sitting on the throne, the castle changed its appearance to suit the virus, and turning the residing soldiers in the castle in his loyal Sentinel army.
The Fortress retained the use of dungeons and a throne room for megabyte. In addition the throne room also featured acid pools.