Game design guru Michael John posted an ode to the game sensibilities of the Prius when it was (ahem) the only game in town: http://www.methodgames.com/methodb

Game design guru Michael John posted an ode to the game sensibilities of the Prius when it was (ahem) the only game in town: http://www.methodgames.com/methodblog/files/archive-4.html#unique-entry-id-34 http://www.methodgames.com/methodblog/files/archive-4.html#u... All you need to make a game is a feedback loop with some challenge (an implied reward) for the user. With the Leaf, the challenge is a lot more explicit, but any number representing performance quality is challenge enough. Fuel efficiency metering is a great example of this, and also of gentle teaching which inspires users to become more passionate.