Okay, so Crystal Mines is this weird little NES gem (pun intended) that feels like someone mashed up Dig Dug and Gauntlet after too much caffeine. You're basically this little dude mining crystals underground, but everything wants to kill you—bats, spiders, those annoying bouncing blobs. And the deeper you go, the more chaotic it gets.

What's funny is the same game got reskinned later as a religious title (thanks, Wisdom Tree). But the original version? Pure 8-bit chaos. You'll be digging tunnels, dropping rocks on enemies, and panicking when three different monsters corner you in some narrow passage. Controls are a bit stiff, but once you get the hang of it, there's something weirdly satisfying about the whole thing.

Just don't expect it to go easy on you—this is NES-hard, where one wrong move means starting the whole level over.