This is the wrong place for the complaint. Here’s where you need to go:
This isn’t even an American issue since the SCOTUS ruled Video Games as protected free speech no matter how much violence or nudity/■■■ is in them. Anytime a store asks for ID to buy a M-rated game its a store policy, not a law, regulation, or ordinance (all are illegal under the US Constitution). But stores reserve the right to not sell content they do not agree with.