I still don’t get why it has 4.9 ratings. I bought all book until book 4 so I am finishing it. I find it too short and mostly covers one floor per book. So I assume the author wants to make money until floor 13, 15 or 18 or more. It’s not as fun and witty as He who fights monsters nor as number crunching and adventurous as Chaos Seed series. I am not sure I would recommend it.