Happiness Bar
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A blockhead's happiness bar shows the speed of a blockhead. It is calculated according to hunger, environment, energy, and health bars. When its happiness bar lowers so does the speed of the blockhead. By keeping its happiness bar at maximum a blockhead will be able to travel faster, craft quicker, and mine faster.
Unless a Blockhead is wearing the sunset skirt of happiness, a Blockhead's happiness bar will not be higher than its health bar, so if all bars are at maximum except happiness, it might be a good idea to check to see if the health bar was overlooked.