A little random, but what are the special coins used for? I got a couple from random events but I haven't found any shop on the site to use them. Is it for a holiday or something?

in the bottom left corner of the centropolis map there's some stairs - this gets you to a couple of things, including the coin machine. afaik the rewards are random, but there are a few coin machine-exclusive items. i like to use the coins when i get them 'cause sometimes you can get stats for your active pet and i think some people have received subeautique clothes from them? but that's pretty rare and the coins also sell for more than most of the exclusive prizes are worth, so it's a bit of a risk to use them p:

Cool Thanks! I figured I just wasn't looking hard enough/ looking in all the wrong places!