Some of the contributing authors were listed only by their game names rather than real-world names. "A generally accepted criterion for authorship is that authors must take responsibility for the integrity of the paper," says the journal's editor ... "In my view, identification of an author only by a screen name, which can be changed at an instant, is inappropriate, since that person could not be contacted if issues of accountability arose."
In the end, the players who are listed as co-authors simply agreed to have their full names listed.
http://www.sciencemag.org/news/2016/02/rna-paper-based-computer-game-authorship-creates-identity-crisis [sciencemag.org]
http://www.sciencedirect.com/science/article/pii/S0022283615006567 [sciencedirect.com]
http://www.eternagame.org/web/ [eternagame.org]