"The biggest and most important difference is that single-player games don't have what you call a continuity problem in the storytelling, simply because you don't have multiple people in the game world," said Mipam Thurman, 27, an avid gamer who works in marketing for Tibet House, a New York City nonprofit group. "In a single-player game, if you kill the dragon, it's dead forever. In a multiplayer game the dragon respawns every 20 minutes so the next player can kill it. So in a single-player game the village that was being besieged by the dragon can forever thank you and be grateful, but in a multiplayer game that can never happen. So the accomplishments in a single-player game can seem much more important and memorable."