I think we should add a category in which the only requirement is to complete the Brickster mission. I might get the response, "The Brickster Mission - like all missions - is a side mission." Wikipedia says that the PLOT of the game is to catch the Brickster, therefore, when the Brickster is caught, the plot is completed. While the game does never end, the main quest is completed. In Skyrim, the game can never be completed, however in the any% category on http://www.speedrun.com/skyrim/ the run is completed when the main quest is completed.

You can see the Wikipedia page here: https://en.wikipedia.org/wiki/Lego_Island#Plot