Crystal (also referred to as Kris), is one of the three resources in pr0game and is mined in the Crystal Mine.

Crystal is required for the construction of all buildings, ships, defensive structures (except for Metal Storage and Rocket Launchers) as well as most projects in research. Especially later in the game, crystal becomes increasingly important, as particularly in the field of research, a lot of crystal is required.

Crystal can be mined by the Crystal Mine, but even without a mine, a base amount of crystal is produced on every planet (20 units per hour in standard universes).

Since there is rarely a surplus of crystal, the demand is correspondingly higher than for metal. It is usually traded as follows:

Metal:Crystal:Deuterium = 3:1:1 or 3:0.5:1. Rates in between these values are also common.

Due to the high crystal costs in the later stages of the game, a crystal shortage often occurs, which leads to crystal being in higher demand in a universe than other resources and is offered less frequently.

Higher building levels, the Research Laboratory, and more advanced buildings such as the Terraformer or Moon Bases require more crystal than metal.

The Graviton Research, which is essential for the construction of the Death star, requires a significant amount of crystal, which can lead to a shortage for players focusing on this research.