Question: Madmaze, an online video game designed by Eric Goldberg, was devoped by what American game designer and science fiction writer that is known under the pseudonym "Designer X"?
Sentence (from "Greg Costikyan"): Greg Costikyan (born July 22, 1959, in New York City), sometimes known under the pseudonym "Designer X", is an American game designer and science fiction writer.
Relevant evidence: Yes