Playing without a DM
This might seem to be strange advice for a Dungeon
Master’s Guide, but it’s entirely possible to play D&D
without a Dungeon Master. If all you’re looking for
is fun and exciting combat, with no more than the
barest hint of plot or purpose, a random dungeon with
a random encounter deck is all you need. Someone
needs to prepare the deck, and someone needs to run
the monsters during the game. They doesn’t need to be
the same person. All the players can decide together
what the monsters do, and let the player who’s the
target of an attack make that attack roll (or have the
person to the left roll for the monsters).