The Forgotten Ruins tells a story about some people looking for a hidden treasure within the ruins. The party took the challenge following the Book of Forgotten, then got the treasure. Now they have to return to the surface.
This game reverse the progress on each floor. Their level will be decreased. The main protagonist will also has to use Book of Forgotten as a requirement to open the portal. The more Book of Forgotten used, the more their skill will lost. The skills lost from using the Book of Forgotten is randomly selected.
All monsters will not drop money or any item. The only item you can get is by using the money you get from the first treasure chest. There are no revival item. The imaginary party will permanently knock outed if their HP reach 0.
