Remember last month when Nine Sols developer Red Candle Games started teasing… something… related to the Metroidvania? However it has led to something interesting: Red Candle Games have hidden an entirely new game within Nine Sols. To unlock this game within a game isn't particularly complicated. Here, just type in "shanhaiarchive" and a download will start letting you play what is essentially a completely different, relatively short, first-person horror game. It's also worth noting that this appears to be a limited-time event, so if you might want to carve out some time for it.