Lindsay Grace discusses game design principles and how game verbs can be used to facilitate change. She teaches that game design involves interesting problems and doing. Games begin with a goal, obstruction to the goal, and means of achieving the goal. Common goals include getting to the end, collecting items, and finding objects. Obstructions are often situational and relate to a character's needs or state. Game verbs are the means of overcoming obstructions, like running and jumping. Grace discusses expanding the universe of game verbs to include more complex verbs that can encourage empathy, political change, and social issues. The verbs used in a game are as important as those not included and should be enticing to players without masking the intended meaning.