Primordia is a point-and-click adventure set in a post-apocalyptic world void of human beings. Cast-off and long defunct machines litter the land, in which a few intelligent robots try to survive with what little resources they can gather. One of them is Horatio Nullbuilt, the main character of the game. A spiritual and independent individual, he spends his time studying the Holy Book of Man and tinkering with the derelict airship he calls home. His droid sidekick Crispin, also built by him, sports a much more sarcastic outlook on life. Their existence becomes threatened when a hostile robot steals the power core that the pair needs to survive. So, Horatio and Crispin set off in search for energy.
Primordia has a typical point-and-click interface: a left mouse click to interact with objects, a right click to examine them. Every function needed is always available from a drop-down control panel that appears when you move the pointer to the top of the screen. Items can be combined in the bottomless inventory and may be used on every hotspot and character. Crispin can be told to interact with objects, too.
As Horatio and Crispin wander about, a datapad automatically stores codes, passwords and information about the world. The datapad also contains a map which allows fast travel with one click to every known location. Conversations with other robots are handled in a multiple choice fashion. There is both a manual and an automatic save system.
In addition to the voice-acting cast, the game also features detailed in-game developer commentary.