Dungeons & Dragons games may span one or many play sessions, and involve two or more participants. In each session, one or more takes on the role Dungeon Master, and the rest take on the roles of player characters. The group may run as little as a single encounter together, tackle a complete adventure, or even conduct a long-term campaign over many sessions.
Dungeons & Dragons is designed for play in swords and sorcery fantasy settings, but has been adapted to other settings.
Main article: 4th edition
Wizards of the Coast began publishing previews for the 4th edition of Dungeons & Dragons in 2007. The finalized core rulebooks were published in June 2008. 4th edition's original designers were Rob Heinsoo, Andy Collins, and James Wyatt.
Main article: 5th edition
The 5th edition of Dungeons & Dragons, called D&D Next in early marketing materials, began home playtesting in May 2012, and launched in summer 2014.