Some weeks ago (I don't really remember when) a guy came to this forum and asked for a forgotten title, if I remember well, he gave a description about the novel, I don't remember it all, just that it was a novel about death game, a normal world that was changed into a death game. This novel was on royal road, but the guy decided to take it out and sell it on amazon, I thought I had save the title, but didn't find it again :/
If you commented on the thread, go to you profile and click "your content" and it should be on a thread with one of those message. Otherwise use the previously stated methods. It'll take awhile but it's probably your only way