Introduction to connected caves: Many caves extend in all directions with many forked roads. Entering one of them is like walking into a big maze. In the maze, some places are bright and spacious and can accommodate dozens of people, while other places are dark, cramped and pitch black. Traveling through the cave requires you to use eighteen martial arts skills such as drilling, climbing, climbing, and moving, which is extremely exciting and interesting. Sometimes you have to turn sideways and tuck your abdomen in and move close to the rock wall. Sometimes you have to bend down and lower your head to pass by. Sometimes you even have to use your hands and feet to climb up.