Survival Game: Build a Dungeon

Humanity around the world has entered a survival game. Five survival games: winter, scorching sun, deep sea, wasteland, and desolation. Zhao Yuan entered the desert survival game. In this game world, it is desolate, all kinds of materials are extremely scarce, and sandstorms are often raging. In such a world, Zhao Yuan struggled to survive, starting from a small cave and building a huge underground city!