Offline challenge question.

[Blue-Hawk]

Can it be completed with only 2 characters? Or do I need 4 people? Because I don't have two more offline friends to play with. I only have 1.

[geewj]

I don't really know, but I think these people do.

http://www.pso-world.com/viewtopic.php?topic=58565&forum=17&8