What Regression Testing Taught Me About Replaying Old Games

Regression testing is one of the less glamorous parts of my job. You’ve already proven a piece of a system works, some feature shipped months ago and hasn’t been touched since, and instead of moving on you go back and test it again anyway, specifically because nobody’s looking at it anymore and that’s exactly the condition under which things quietly rot. A dependency updates somewhere upstream, an assumption that used to be true stops being true, and the feature that worked fine in March silently breaks in October and nobody notices until a customer does.

I started noticing a while back that I apply the exact same instinct to my shelf, except I didn’t have a name for it until I actually sat down and thought about why I keep pulling old favorites back out instead of only chasing what’s new. It’s not nostalgia exactly, or not only nostalgia. It’s closer to regression testing. I already decided this game or book was good, some number of months or years ago, and I want to know if that’s still true, or if I’ve changed enough, or the genre’s moved on enough, that my old rating doesn’t hold up anymore.

The honest truth is this catches real drift more often than I’d expect. A combo-driven engine game I loved hard on release sometimes reveals, three or four plays later once the initial excitement’s worn off, that the “aha” moment doesn’t recur the way it did the first time, the engine clicks once and then just repeats itself. That’s not a flaw I’d have caught on a first play, the same way you wouldn’t catch a slow memory leak on a system’s first day in production, it only shows up under sustained real use.

The flip side happens too, less often but it happens. A book I underrated on a first read because I was reading it wrong, distracted, comparing it to something it wasn’t trying to be, sometimes reveals itself properly on a second pass once I actually give it the attention it wanted the first time. I don’t retest everything on my shelf, that would eat every free evening I have and Priya would have opinions about it. But the habit of periodically going back instead of only chasing forward has genuinely changed some of my ratings, in both directions, and I trust the shelf a lot more for it.