Kether is a mix of genres that include space flight, puzzle-solving and corridor shooting. The story takes place in space above the planet of Kether. An evil force by the name of Khork has kidnapped a princess by the name of Eta Carene and a young warrior by the name of Melkhor along with his space cruiser Anterte . They must travel to five different temples orbiting in space above the planet, explore them and face off against the ultimate evil to save the princess.
The gameplay starts with choosing which temple to explore. When selected, the game perspective takes on a space flight where the player dodges asteroids and collects green orbs scattered throughout to gain an extra energy boost. The goal is to complete the stage in a set time limit. To enter the temple, the player must solve a mysterious puzzle within the time limit. If successful, they can then enter the temple.