Both games use an adventure storyline to capture the children's interest and attention, and thereby enhance their desire to keep coming back to the game across multiple sessions (between which behavior change goals are attempted). The storylines provide messages that reinforce the diet and physical activity change objectives. Seamlessly woven into each adventure session are programmed procedures for promoting behavior change (goal setting, goal review), which were tailored to characteristics of the child obtained through self report. Behavior change knowledge games, seamlessly woven into the storyline, are used to provide the basis for effective goal setting; and energy balance games, also seamlessly woven into the storyline, are used to provide the knowledge necessary to effectively self control caloric intake and output.