Did the protagonist of any novel create a virtual world or a virtual game?

There are many such novels. Let me recommend one for you first. 1 makes accommodation seem to be called the tree of knowing the world or the tree of knowledge. Anyway, he got a book of knowledge of the God of Knowledge, and then he wanted to collect beliefs. He can travel outside to collect beliefs, and then build his own kingdom, but when the kingdom is established, it is illusory, equivalent to the type of online games, and then slowly it is temporary. When he first established the kingdom of God, he turned it into a virtual world in the form of online games, and then let people on earth play games in it, because playing games in it can bring him the power of faith, as if 100 people can bring him a little power of faith every day. Although this base is a little small, there are at least two or three billion people playing that game all over the world. Considering that two or three billion is in the middle, it is a very impressive number, not to mention that he is not only a person on the earth, but also other outsiders who play in his virtual games.