Taiko no Tatsujin: Rhythmic Adventure Pack, also known as Taiko no Tatsujin: Dokodon RPG Pack!, is a re-release of Rhythmic Adventure 1 (Don to Katsu no Jikū Daibōken) and Rhythmic Adventure 2 (Dokodon! Mystery Adventure), bundled into one game. Rhythmic Adventure Pack is the first Taiko no Tatsujin game to feature a story mode translated into English. In addition to the two RPG modes, Taiko Mode was also included and featured 6 new songs not included in the original releases. The DLC songs from the original games are not included in the game. Rhythmic Adventure Pack is available physically in Japan and Asia; however, only a digital version will be available in Europe and North America.
Source: Wikipedia, "[en.wikipedia.org/wiki/Taiko_no_Tatsujin%23Taiko_no_Tatsujin%3A_Rhythmic_Adventure_Pack Taiko no Tatsujin]", available under the CC-BY-SA License.