The Hidden Dungeon Only I Can Enter (俺だけ入れる隠しダンジョン 〜こっそり鍛えて世界最強〜, Ore Dake Haireru Kakushi Danjon ~Kossori Kitaete Sekai Saikyō~)[a] is a Japanese fantasy light novel series written by Meguru Seto and illustrated by Note Takehana.

It began serialization online in January 2017 on the user-generated novel publishing website Shōsetsuka ni Narō.

Some are lucky to find them, like Noir Stardia, the third son of a minor noble family, who acquires an exceptional skill that provides him great knowledge.

Noir is given a job offer by his childhood friend Emma Brightness, who has a cure for his headaches.

[50] The opening theme song (from episode 2 onwards) is "Pyramid Great Reversal" (ピラミッド大逆転, Piramiddo Dai Gyakuten) performed by Spira Spica, while the ending theme song is "Nemophila" (ネモフィラ, Nemofira) performed by COALAMODE.