Do not force ads on children. It is inappropriate, even with a so called free app, to expose children to ads in this way. Put them on the menus where the parents or guardians will setup the game. That is fine. Do you really expect pre school children to understand ads....or just increase you click through rate with accidental clicks from the kids. Shameful.
The toggle switch above the volume is not always mute as you indicate. It is adjustable in settings, per device. Know the device you are developing for. Horrible developer.
DHirschfelt about My First Skills