These results indicate that time spent on games in general did not increase physical aggression, but playing violent games did cause an increase in self - reported physically aggressive behavior. (link.springer.com)
Money spent on games means money that isn't spent doing other activities within the city. (sbnation.com)
Playing these games then rewards players with coins, which can be spent on another game in the attempt to win objects that are displayed throughout your park. (gamesugar.net)