Setting sun is an upcoming Co-op Roguelite Dungeon Crawler. It's set in a universe during the Japanese Edo period where Yokai roam the world freely. The land is in turmoil because the Shogun rules with an iron fist. A couple of mysterious wanderers answer the call to help mankind and try to fight the source of the corruption together.
The mystery room was revamped in 0.8. Now you can choose between the gold chest and the mystery box. A gold chest is a gold chest but the mystery box could be anything, even a gold chest