Netflix has a secret menu with hundreds of hidden titles not on the main platform, which can be accessed using codes associated with specific genres. The codes can be entered into the URL or search bar to unlock the alternative catalog. Categories include 'High Brow Horror,' 'Irreverent TV Comedies,' and '90-minute movies.' Netflix introduced these categories to help users find the right content in the moment. The streaming service continues to expand its categories, with some inspired by a 'Saturday Night Live' sketch in 2022.