Welcome to the fifth floor. Here, you may be able to find your closest family and friends, but don't explore Science Experiment Class No. 1 Easily. Come on, stupid challenger. In this battle royale, there is hope only if you are alive. Come and uncover the mask of this world. Remember to be careful with your brain!
Purpose: Uncover the darkness in your heart. When betrayed by the whole world, remember to stick to the light.