This site does have games on it, however, after playing with a few of them, I did not see much connection to the game and the math. The site did have good visuals and step by step procedures for solving a variety of problems. I would probably use it for the purpose of a refresher or if someone is still struggling with a concept and not for any games. The games I did play on there are fun for young children, just no math content relationship.
Math Games Collective