Crystal Guardian

Crystal Guardian is a tower defense and survival game in which you protect a crystal from enemies that emerge from different biomes each night. You place towers to counter biome-specific creatures, while managing hunger and thirst by exploring and gathering resources during safe daylight hours. The game restarts if the crystal is destroyed or you die, and your goal is to learn from each attempt and survive until the 100th day.

Defend the crystal

Enemies appear from different biomes every night at 00:00 and try to destroy the crystal. Each biome has its own enemies, and tower types differ in how much damage they deal to them. For example, a Snow biome enemy takes more damage from a Fire tower than from an Ice tower; against an enemy from the Desert biome, the effectiveness is reversed. Tower placement is central to defending the crystal.

Explore the biomes

You can place maps wherever you like. Each time you play, maps are randomly selected from 11 versions of each of the four biomes, with resources and enemies varying between versions. Each biome also has different resources, which you gather during the day to address hunger and thirst. New maps can bring new resources as well as more enemies each night, so you must account for the map’s layout when positioning your towers and the crystal.