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Most people think SWG was strictly a sandbox game, but it actually contained several "Themeparks" before the term was used in referance to linear MMO games like WoW or even EQ. (No one called EQ a Themepark in '99)
In SWG Themeparks meant Linear Content based around certain factions story missions.
For example, the Emperor's Retreat in Naboo was the "Imperial" Themepark. You would go there and begin be doing missions for the Guard at the door, then the Captain of the guard, until you were speaking directly with Thrawn, Vader, and then eventually the Emperor himself.
The missions were there almost solely for people who wanted a linear experiance and wanted the Star Wars Lore handed to them rather than interpreted from the game world, as they gave you little in the way of reward....
*I remember a Captain of the Guard giving me three Melons as a mission reward, which was usless until the great melon nerf 2004 which reaped me many credits from AH from selling them a year later.
I just thought I would post this as many people have been unclearly posting on what they assume was a "Thempark SWG" that never exsisted.