Lionhead boss Peter Molyneux has revealed there will be a total of three Xbox Live Arcade games that will let you earn money for use in Fable 2. These "semi-gambling" games will reward you with Fable gold if you win. When Fable 2 eventually comes out (sometime this autumn), you will be able to use your accrued funds in game.
Anything from dungeons to castles to shops are up for grabs, and splashing out on them will unlock side-quests to explore. As for houses, well, take your pick.
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