Elyse Betters Picaro / ZDNET

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ZDNET's key takeaways

Netflix codes open hidden genre and micro-category pages.

Codes work best in a browser, but can work in the app.

They don't unlock extra titles outside your Netflix plan.

I've used Netflix for decades. I had it back when it still delivered DVDs, so I know how to use the streaming service. I've also written a ton about it over the years, like recommending my favorite Netflix codes, tips, and tricks. "Codes?" you might be asking yourself. Yes, there are hundreds of Netflix codes , and I regularly use them to find hidden movies to watch for free.

Netflix organizes its entire library into several genres and micro-categories. Each one has a numeric code associated with it. Some are broad, like action and adventure , while others are weirdly specific, like deep sea horror movies . These codes won't unlock new movies, paid extras, or content outside my plan.…