This is a small-ish collection right now but I'll add to it eventually.
Masters of the Universe: The Power of He-Man
I had the Intellivision version of this game.
After a few rounds it becomes impossibly difficult.
Advanced Dungeons and Dragons: Cloudy Mountain
Great vintage 80s artwork here.
Speaking of artwork, it's kinda funny now how they use renditions of screen shots rather than actual screen shots (which probably required a lot of effort at the time).
Advanced Dungeons and Dragons: Treasure of Tarmin
This is my favorite ad on this page, partially because it's my favorite game on this page too.
Treasure of Tarmin is an amazing game for the time and the artwork in this ad fits it perfectly.
Nice color scheme on this one, I wonder when crazy neon colors will come back into style.
The Intellivision version of TRON Deadly Discs was one of my favorites, haven't tried the 2600 one yet.
Lock 'n' Chase
Among the many Pacman knock-offs, Lock 'n' Chase was one of the best.
Frogger II
I don't really recall seeing this ad when it was new but it's a nice one.
Mario Bros.
How weird is it to see "Atari presents Mario Bros."?
Moon Patrol
Finally, after years of wondering I now know the storyline for Moon Patrol.
Frogger
The home Frogger ports all played well enough. The 2600 graphics look pretty not great but mechanically it was alright.
Spider-Man
I wish someone would remake this game using the graphics in this ad.
M-Network
I own a solid stack of these games despite also owning the superior Intellivision versions. I have a problem.
Popeye
Never been a fan of this game. It's enough like Donkey Kong that I should be but I dunno, maybe I just never cared for the characters or something.
Atari Advantage
When this ad was released buying 25 Atari cartridges set you about about $14.
Kool-Aid Man
These are two completely different games. The Intellivision one looks better but is painful to play. The Atari 2600 version is actually sort of fun.
Kool-Aid Man Offer
125 Kool-Aid packets... that's a lot of tooth decay.
Burgertime
The Intellivision version of Burgertime turned out great.
Q*Bert
I'm surprised there hasn't been some crazy Q*Bert Championship Edition by now.