There are plenty of measures that can be taken actually. Starting from the ordinary limitations up to the parent control apps installation. I vote for the second variant. Simply because I consider such a measure the most effective. When I presented my son with a smartphone I installed the app called mspy on it. I have chosen this app first of all because I can view a list of all apps installed on the devices and block those I don’t wish my kid to use. I have forgotten about any problems with video games simply because I can see pretty clear picture on my cell phone. So, you can choose any way of monitoring you like, simply be aware of the video games content. Good luck.