Theatrhythm Final Fantasy has 4 player Co-op Mode.

[cyberninja45]

http://www.siliconera.com/2012/02/06/level-up-together-with-theatrhythm-final-fantasys-cooperative-multiplayer-mode/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+siliconera%2FMkOc+%28Siliconera%29

 

From article:

"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.