Players create and role-play superheroes in the Paragon City setting, the titular City of Heroes from the computer game. Players' characters are customizable in appearance and super abilities. Many enemies from the computer game are translated into Unisystem characters, such as Dr. Vahzilok and the Circle of Thorns.
An official free downloadable preview of the game containing a sample adventure, characters and basic rules was also available.
In June 2006, a company press release on their official web site announced that the Registration Manual and Monitor's Support Pack (the two main rulebooks for the game) were nearing completion and getting ready to go to press. Despite this, financial strains at Eden Studios meant the game would not see print until at least 2007.
As of March 2008[update], the game had still not been released. Earlier that year full ownership of the City of Heroes/Villains intellectual property had been sold by Cryptic Studios to the publisher of the game, NCSoft. George Vasilakos, owner of Eden Studios, stated in the official Eden forums that this had impacted their ability to release the game, but that further information was waiting on communications between the involved companies.