Question: What game did the writer of "Blackmoor" help co-develop?
Sentence (from "Dave Arneson"): Arneson's early work was fundamental to the development of the genre, developing the concept of the RPG using devices now considered to be archetypical, such as adventuring in "dungeons" and using a neutral judge who doubles as the voice and consciousness of all other characters to develop the storyline.
Relevant evidence: No