In the initial version of the game, the career mode consisted of 180 events split into eight "seasons", which become progressively more difficult. In later versions, additional challenges were added to the seasons. When the game begins, only Season One is available. Later seasons must be unlocked either by earning a certain number of stars or by purchasing a "Season Unlock" in the in-app store.[10] The Great Wall update added 30 new events centered on the Great Wall. The Dubai update introduced a new season where only fully upgraded cars are eligible to participate, besides adding three new events centered on Dubai.[citation needed] The San Diego Harbor update introduced a new season featuring events where the player can participate in a twenty-four car race (Exclusive Metal Events - only on iOS 8), alongside several new events centered on both Dubai and the San Diego Harbor
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