The Mysterious Training Camp

To defend against an alien civilization, humanity activated a mysterious creation left behind by a god-level civilization: the Zero Meta-Universe. Everyone entered the mysterious cultivation camp, and the great age of cultivation began. After entering the camp, Meng Yan was astonished to realize he had played this game before. He knew every map, level, monster, boss, and everything else inside it like the back of his hand. In the cultivation camp, he could train however he wanted and play however he pleased!