After we have done the work of identifying our objectives, defining target behaviors, scoping our players, and laying out the activities of our system, we can finally think about the area of the system where many novice game designers start: the fun. Other gamification practitioners will avoid, or at least disguise, the fun aspect of the gamification design process. It is important that we don't over or under emphasize the fun in the process. For example, chefs prepare an entire meal with spices, but they don't add all spices together. They use the spices in a balanced amount in their cooking to bring flavor to their dishes. Think of fun as an array of spices that we can apply to our activity loops.
Marc Leblanc has categorized fun into eight distinct categories. We will attempt to sprinkle just enough of each, where appropriate, to accomplish the desired amount of fun. Keep in mind that what one player will experience as fun will not be the same for another. One size definitely does...