Freemium games, requiring often-expensive in-app purchases to make them actually enjoyable, are one of the pain-points of modern parenting. You either give in and pay, or risk dealing with a tantrum when you refuse.
The latest South Park episode, which aired yesterday, gives the phenomenon a well-deserved ripping. You can, until it inevitably gets pulled, watch the episode below.
[youtube=https://www.youtube.com/watch?v=Wy4MCoZ5K3A]
You can legally watch it here! http://southpark.cc.com/full-episodes/s18e06-freemium-isnt-free