Adventure mode is a category of game types introduced with Reaper of Souls. This mode of play gives players access to Bounties and to Explore.
Adventure Types
- Bounties are set tasks. For example, locate and kill a Superunique or Boss monster or complete an event or clear a dungeon and be rewarded with Experience, Gold and possibly a Rift Keystone. You access a Bounty by using the Waypoint map and selecting a waypoint marked with an exclamation mark (!) or Diablo's skull icon (indicating boss or quest boss). [1]
Adventure Requirements
It's not yet known at what level your character needs to be before you can access Adventure mode but it is known that you are not required to have completed normal difficulty in Campaign mode first.
Adventure mode is a flat difficulty and is scaled to your character, there are no difficulty settings such (normal, nightmare etc)[1]