Technical layer. Official website introduced that a Netease game, the ruins library, the index finger is suitable for the science and technology layer, and the butterfly self in the science and technology layer is passively added by killing one person with a knife. Basically, one person must lift, and the index finger can play a great role in the scientific and technological layer. Ruins Library is a card strategy game produced and distributed by ProjectMoon, which was officially released on May 15, 2020.