Source: http://www.megalextoria.com/wordpress/index.php/2017/05/04/g-a-m-e-s-1983/
This is an add for a mail-order video games company aptly named G.A.M.E.S. (though I'm not clear what that stands for) based in Van Nuys California. I'm not really familiar with them but this ad is from 1983 which was a few years before I started paying attention to magazines.
This particular ad has a variety of interesting things for the Atari 2600, Atari 400/800, Colecovision and Intellivision...
Read more: http://www.megalextoria.com/wordpress/index.php/2017/05/04/g-a-m-e-s-1983/