Core Mechanics

7 Days to Die is a survival horror game where you build, scavenge, and fight to stay alive in a destructible open world. Here is how the main systems fit together, including what changed in V3.0 "Dead Hot Summer".

The Blood Moon horde

The name of the game refers to the Blood Moon - a horde night that arrives every 7th day by default. Once it starts, waves of zombies (and infected animals) swarm toward your location until dawn. The frequency is configurable, so a server can run shorter or longer cycles. Surviving a Blood Moon depends on the base and defenses you have built during the days in between.

Biomes and progression

The world is split into biomes - temperate forest, burnt forest, desert, snow, and the scorched wasteland. The forest is the gentle starting biome, and the harsher biomes (desert, snow, wasteland) carry tougher enemies and better loot. Pushing into rougher biomes is the main way you raise both the danger and the reward as you progress.

Voxel building and mining

The world is voxel-based, so almost everything can be dug out, harvested, or built on. You mine resources from the terrain and shape your own structures block by block. Structural integrity is simulated - a building with no support, such as walls or floors with nothing under them, can sag and collapse. Sound bases account for weight and support, not just walls.

Day and night zombie behavior

Zombies react to the day/night cycle. During the day many are slow shamblers with short detection range; at night - and during a Blood Moon - they become feral, moving and attacking far faster. They are drawn to noise, light, and signs of player activity, and once they detect you they keep coming until they are killed or the obstacle between them is destroyed. Stealth and distraction can let you avoid fights you are not ready for.

Looting and the V3.0 Item Magnitude system

Looting containers, POIs, and fallen enemies is how you gather most of your gear and resources. V3.0 introduces Item Magnitude, a system that scales the quality and stats of loot and gear. Boosted, higher-magnitude drops (often shown with an orange star) carry stronger stats, which gives loot a clearer sense of rarity and reward as you climb the biome and progression curve.

Crafting and skills

You craft tools, weapons, armor, and base parts from materials you gather and refine. Tools and gear wear down with use, so you keep crafting and upgrading as you play. A skill and perk system lets you specialize over time, shaping how your character fights, builds, and survives.

Tuning it all with V3.0 Sandbox options

V3.0 "Dead Hot Summer" lets you tune most of these systems directly. Its Sandbox options (150 options plus 11 presets) and SandboxCode replace many of the old gameplay properties, so server admins can adjust Blood Moon frequency, difficulty, loot, and more without hand-editing config files. See /3.0 for the full feature list.