Revisited the first iOS game I built (~15 years ago), back when I was learning Objective-C. Non-ARC, old cocos2d, iPhone4 layouts.
Spent a few hours doing manual cleanup, removing things like Flurry + old Game Center code, and fixing enough to make it compile.
It builds. It runs — including proper aspect-fit scaling on modern devices.
Apparently I had even built an After Effects to XML level design system pipeline. Not entirely sure how. 😅