Resident Evil 7: Biohazard · Difficulty unlock
Madhouse Difficulty
Madhouse changes enemy strength, item abundance, and autosave frequency; the guide also lists completion on Madhouse as the Infinite Ammo unlock condition.
How it works
The gameplay passage says Easy, Normal, and Madhouse affect enemy strength, abundance of items, and how often the game autosaves. It specifies that Madhouse requires a cassette tape to save at a tape recorder. The unlock guide says Madhouse is available from preorder or coins DLC, or by beating the game on Easy or Normal; it does not establish whether these access conditions apply to every edition.
Read the supporting references
Resident Evil 7: Biohazard - Wikipedia Steam-Community :: Guide :: Resident Evil 7 Overview of Unlockables
Check the edition and source version for patch-specific details. Guide methodology.