BioShock creator Ken Levine's new game could be open world, according to a new job listing.

A listing at the Irrational Games website states Levine's team is seeking a gameplay systems designer with "experience in a semi-open or open world game."

Borderlands and Middle-Earth: Shadow of Mordor are listed as examples of "semi-open" games.

Experience in the Unreal engine is also required, while "passion for narrative First Person Shooters" is listed as "a plus."

Levine's game has previously been said to be set in a new sci-fi universe, and to focus on "fluid relationships."

Recently, Take-Two CEO Strauss Zelnick referred to the game as "something highly creative and innovative."