You are allowed to start topics about the game you are playing. Just start the topic by putting subject as the name of the game. For one topic, you are only supposed to talk about that particular game.
E.G. Subject: Fifa Street......
This is how the subject title should be.
E.G. Subject: Fifa Street, WWE, Blah blah...
This is not allowed. This is because if you start a topic like this, it would be very confusing. Thanks.