Mysterious Training Camp

In order to resist the invasion of alien civilization, mankind activated the mysterious creation left by the god-level civilization - the zero-element universe. All mankind entered the mysterious training camp, and the era of great cultivation came. After Meng Yan entered the training camp, he was shocked to find that he had played in this training camp before. He knows all the maps, levels, monsters, bosses, etc. Inside. In the training camp, he can practice however he wants and play however he wants!