Unturned is a free Minecraft style zombie survival game that is in steam. The zombies are everywhere you turn and sometimes you may not even know they are there.
They can even flip and turn a car which can end up catching on fire blowing up and killing you. There are 6 different maps that are medium and large that allows you to explore and die quicker, I mean loot things a lot of things. You can also craft things to help you kill the zombies and survive.
You are and can loot basically everything which is nice and easy to find more clothing, weapons and other things. This game you also have to worry about toxins, food, water, energy, and something else, not sure what the bubbles are but it is important.
You can basically find and loot seeds and plant them so you can have food. We have been trying to play with friends but unfortunately, it looks like only solo and single player is available unless you give whom ever you are playing with your connection codes to allow them to join on you.
This game is on PS4, Xbox, PC, and so many other places but it is not cross play.