Adventures adds a new branch of gameplay to the Spore experience, accessed from the main menu. Once you click on it, you have your pick of preset adventures on present worlds. Each adventure is like a long MMO quest with a series of goals spread out over up to five “acts.” That probably isn’t the best way to sell it, but it works way better than it sounds. Moreover, it also integrates into the main game – so instead of the lame existing set of stuff you have to do during space exploration, you actually get the chance to play out one of these adventures instead.

Plenty more to be read – Kotaku:  3 Things that stand out about the Spore Expansion