@Jefflm 

You best solution would to get a 3rd party firewall (hardware based) or some some sort of external partental control service, such as Disney Circle (though we cannot tell you if that will work or not. Only mentioning it as an example)  WOW is an online only and Minecraft can be played locally or online.  Steam on the otherhand is a platform and games are locally stored.  

Thanks Carl, Are you saying that the Parental Controls on the C900 don't really block these sites? What does the actual keyword block feature do? For example, if I say block/blacklist 'WorldofWarcraft' and 'Warcraft' would it not block any sites with that word(s)in the url? Is there any way I can tell what the parental control has actually blocked? Any way to see what websites are successfully visited? System Log doesn't do that. You mention that Steam is a 'platform,' what does that mean? Most concerned about blocking WoW and Steam, and I know that if the router and internet is turned off to that device, there is no issue (last resort). 

I'm sure this comes up frequently. Hoping the C900 and TP-Link could do this for me.