If you like museums at your own pace, an audio guide is the sweet spot between “reading every label” and “joining a group”.
This is not the official Sforza Castle website.
Typical setup: rent a handset at the museum desk (often ~€5) or buy a bundle online. Language menus usually include major European languages — confirm on your ticket provider page.
Tip: bring your own wired earphones if you dislike disposable earbuds.