This ran across the glossy four-page centre-spread in Marvel's weeklies (the pages were normally used for strips, single-page adverts and posters... presumably advertisers willing-and-able to advertise across the centre pages were few-and-far between). The final page reserved for the advert itself.
It's only in the small print that it mentions that the game is for the Atari system.
This particular insert appeared in SPIDER-MAN weekly issue 517 (2 February 1983) but, I think, it also appeared in other titles and, maybe, for more than one week.
The UK-exclusive cover to that issue is below. Spider-woman is prominently featured because she occupied the back-up strip slot, thanks to the just-started UK broadcast of her animated TV show (which premiered on ITV on 10 January 1983).