[drewzero1]

At certain karma thresholds, different things unlock. There's a list somewhere but I'm not sure if it's up-to-date.[0] It looks like top bar color can be changed once you hit 250 karma.

[0] https://news.ycombinator.com/item?id=853964

[fuckcensorship]

List of undocumented HN features:

https://github.com/minimaxir/hacker-news-undocumented

[drewzero1]

That's the one I was thinking of, but couldn't find. Thanks!

[themikesanto]

Ah cool, thanks! As someone who mostly lurks, I look forward to engaging with some of these features in a few decades time.