To unlock this, unlock all 42 characters. Then, beat the game with one character from each force.
Obstacles
When dealing with magical obstacles; i.e.: boulders, floods, wind storms, kill the magician that made it to deactivate the obstacle. When it's military; i.e.: catapults, fire juggernauts, free-standing forts. Destroy it with your character attack.
Hint: Red Hare Saddle.
The Red hare is the fastest horse in Dynasty Warriors 4. But if you don't want this cheat, and prefer to just knock off Lu Bu and Guan Yu from it, I guess that's fine.
Well, go to the Battle of Xia Pi and choose Lu Bu's forces(required to beat Musou mode first) and DON'T KILL ANY OFFICERS UNTIL GUAN YU STEALS THE HORSE!! Then, kill Guan Yu and a message bar will appear saying 'A valuable item has been discovered' Go to where the Red Hare was originally and there will be a Red Box. Break it open and you will get the red hare saddle. After, finish the stage by killing Cao Cao.
