An In-Game Timer for Stellaris
I made my first mod for the game Stellaris. Stellaris is a notoriously “sticky” game—i.e. one where you’ll find yourself up at 2AM still playing when you have work the next day—so for years I’ve wanted a feature that tells you you’ve been playing too long. Of course I could set an alarm on my phone, but what I really wanted was an in-game timer. “It’s been five in-game years” or whatever. So finally I learned how Stellaris mods work and implemented it. (You can also see the source code.)
(Stellaris is a game that supports mods explicitly; this isn’t a feat of reverse engineering.)