What survival games do you like?

I love survival games. I really like The Forest, Day Z and The Last of Us (only the first part). Now I'm playing Realmcraft. I thought of downloading Minecraft, but then I found this free clone on the Play Market and decided not to spend money. There is also a survival mode here, you can choose one of four difficulty levels in the settings. The fourth level of difficulty really makes you nervous, but this is exactly what I'm looking for in such games.