Global Travel: I Can Go Back Infinitely

This is a game in which 80% of the world's population participates. Just imagine, when you wake up, I found myself in an empty square room. The walls of the room are made of an unknown alloy and are absolutely indestructible. There were only four door handles on the smooth and unmarked wall, front, back, left and right. There is no food, water, or companions here. Wouldn't it be scary! But... This is just the beginning, all participants must survive in countless parallel planes. But what would it be like to be able to go back infinitely in the world of the heavens? Fear, impossible! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.