๐I recommend the following novels to you, I hope you like them: 1. " Online Game for All ": This game system novel described a world where everyone could change their profession and fight monsters to level up. The protagonist had an instant kill system and could easily kill a max level boss. It was very enjoyable. 2. " Global Class Advancement: I Exterminated the Apostle ": In this derivative doujinshi novel, the phenomenon of global shift occurred, and humans merged the game system with reality. Everyone could choose to change their class to combat or lifestyle. The protagonist became a full-time unspecialized, but when the world collapsed, he destroyed the apostle and became the first human to kill the apostle. 3. " Descending of the Myriad Worlds: Class Advancement for All ": In this novel, the world has changed, and secret realms and forbidden areas are everywhere. In order to save itself, the world will has activated the game system. Everyone can change their class, and the protagonist can clone the secret realm and easily clear the dungeon. I hope the above recommendations can meet your needs. If you have other needs, feel free to look for me.