Taiko no Tatsujin RT Nippon no Kokoro Arcade Machine is a rehabilitation version of the arcade machine which focuses on regaining limb strength.
Taiko no Tatsujin RT Nippon no Kokoro (lit. Heart of Japan) is a simpler version of Taiko and is one of Namco's three different RT (rehabilitation) game machines. This machien is a digital interactive mode of physiotherapy placed in Japanese hospitals to help injured people, especially old folks, to regain their limb strength, and precedes more current alternatives like Wii Fit.
Adjustments made for this purpose are lowered positions of the drums for wheelchair-bound people to play, belts to help patients grip the drum sticks, and much, much simpler notes than anything in the regular arcade. The Tamashii bar which denotes a pass or fail becomes a Strength bar. A special mode aside from normal play is the 'drum hitting' mode, where no music is played, it's just a place where patients can drum to their heart's content while fireworks and festivals play out in the background. Other than that the interface resembles that of the old Taiko engine from Taiko 1 to 6.
RT Taiko has 20 songs, of which 19 are old Japanese folk songs and children songs, and one Namco Original. Nearly all of them are exclusive to RT, and the songs were chosen specifically for its much older target audience. It only has two difficulties, Kantan for training, and Futsuu for following simple rhythm. There is also a software upgrade to raise RT's version to Taiko 6, which includes all 58 songs in the normal Taiko 6.