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The gadget spec URL could not be found
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All successful games have three major principles
  1. Ownership

    Players need to feel a sense of ownership, such as user-generated content
    eg: Creating a restaurant, choosing the tables, the wallpaper and the employees

  2. Progress

    Players must feel a sense of progress, like completing quests or leveling up
    eg: Congratulations, you are now a Level 2 chef!

  3. Viral

    Players are encouraged to invite all their friends to play the game
    eg: You need to invite one friend before you can expand your cafe
FarmVille, the most successful game of all time, has all three criteria in spades.