Dungeon Master Madarame ~Futsu ni Yatte mo Muri Soudakara Casino Tsukurukoto ni Shita~ @COMIC

A lone genius gambler, Madara Metakashi, suddenly finds himself in another world. Upon his arrival, he was burdened with an absurd challenge: to accumulate Ten Billion Dungeon Points by running his own self-made dungeon. Despite numerous unreasonable and unfair rules, his gambling expertise, forged through high-stakes gambling, makes outsmarting the system a child's play. Together with his hardworking partner Kerama, what he creates is... the most unorthodox among unorthodox dungeons... a dazzling, luxurious casino dungeon that doesn't kill people, but traps them in addiction!! "Go ahead and enjoy yourself in my dungeon, [Paradise]." From slot machines to hot springs, and even a buffet...What kind of dungeon is this?! The unorthodox gambler's dungeon-management survival story begins now!