Up n' Down.
It was elementary, my dear Nathan. After taking a closer look at Nathan's hints, I noticed that something didn't add up. Namely, the Roman numerals.
I knew that this was out of place to begin with, but I didn't know what he was referring to at first. I already knew that they translated to 322, 574, and 182 respectively...
...but I didn't know WHY the numbers were significant. Until he said:
So that was when I realized that 574 was the number that mattered the most. But I still didn't know a specific clue telling me what the bloomin' blazes I should be looking for. Then it hit me.
AtariAge, of course! Every game has a URL like so:
http://www.atariage.com/software_page.html?SoftwareLabelID=xxx
So I plugged 574 into the URL, and what do you know. Nathan, you sure did have us search "Up n' Down" for this answer! Ha ha ha! Case closed.