Taiko no Tatsujin: Rhythmic Adventure 2, also known as Taiko no Tatsujin: Dokodon! Mystery Adventure, features over 70 songs and introduces a new Mystery Adventure mode, which adds an RPG adventure to the game. In this mode, Don-chan and Katsu-chan explore Mystery Spots around the world. As the players advance through the story, the player fights in battles and allies with characters. A party can have up to eight characters.
Source: Wikipedia, "[en.wikipedia.org/wiki/Taiko_no_Tatsujin%23Taiko_no_Tatsujin%3A_Rhythmic_Adventure_2 Taiko no Tatsujin]", available under the CC-BY-SA License.