"You can invite a friend, up to three actually, to Theatrhythm: Final Fantasy’s Chaos Temple. In this mode up to four players can earn experience points and find rare items as a group while the Song of Darkness plays.
As a team, you can fight Final Fantasy superbosses like Omega, Shinryu, and Ultima Weapon (pictured).
Theatrhythm: Final Fantasy comes out on February 16."
This is great news for the Japanese audience, as local multiplayer is popular over there. It got a 36/40 from famitsu so more good news the better. But I wish the whole game had it and not just some boss battle mode though.
My 3ds friendcode: 5413-0232-9676 (G-cyber)