Library of Ruina is a unique library battle simulation game developed by Project Moon. The game is available on Xbox One under the role-playing games category. In the game, the player becomes the owner of the library and is responsible for inviting guests and engaging them in combat to acquire their books. The librarians fight for the library, and when a guest is defeated, they turn into a book, which adds to the library's collection. The game's concept of a "Library Battle Simulation" is intriguing, and it delivers an exhilarating experience.

The battles between the guests and librarians are played with cards and dice, and the outcome of the dice is not just determined by pure luck. The game adds certain effects and variables to shift the outcome of the dice for and against your favor. The game's conflicts build emotions, and the emotions of the librarians and guests rise as the battle progresses. The game has a unique concept that is executed well, and the story of the city and the library adds to the overall experience.