Dig or Die Build walls that hold the night

This is survival with a strategy twist: no hunger bar, just the fact that when the sun goes down, monsters attack. The rule is simple and a little cruel: only the species you have killed before come for you at night. Kill a new creature for its materials and you have just invited it to tomorrow's raid. The day is yours to explore, dig and prepare; the night is a siege you designed the difficulty of. A one-minute warning before the swarm hits, then it is you, your turrets and whatever your walls can take.

Your fortress is not decoration. Structures have weight and need support: build a ceiling without pillars and it comes down on you. Bridges and towers let you reach remote places, but they have to stand up first. Water is simulated too, with rain soaking in, underground rivers and lakes, and heavy rains that can raise the water level fast. You drop a wall to block a cave, and the water behind it finds another way. Building strong is not enough; you have to build smart.

Digging is fast, your inventory is infinite and every crafting recipe is shown from the start, so the time goes into exploring and planning instead of hauling ore home in trips or checking a wiki. You dig minerals, harvest plants and take down monsters and bosses for better gear, and the materials you gather along the way are usually enough for the next tier. The world is procedurally generated: the major areas follow a logical progression, but the layout of surface, caverns and ores is new each run.

For anyone who likes the survival crafting loop but not the busywork, this trims it down: gather, craft, expand, defend, with the whole thing pointed at one goal, building the rocket that gets you off the planet. There is more to run than a wall, too. Solar panels and hydroelectric generators power your advanced machines, plants grow and spread on their own when conditions are right, and you can set up farms with artificial sun lamps and irrigation. The game does not hold your hand; you learn by dying, and it clicks.

You can play the whole campaign in co-op, splitting the work of exploring, crafting and holding the night line. It suits a casual shared session: join up, coordinate, and find out together what happens when a raid hits a base two people built in a hurry. If the main mode is not enough, there are custom ones made for shorter runs: Under the Sea starts you in a cave beneath a huge ocean, Sky World scatters hundreds of flying islands, and Base Defense skips exploration entirely. Fair warning: co-op can have occasional desync.