Kessen II [PSX}

Expert Mode
After beating the game as Liu Bei and Cao Cao, start a new game as Cao Cao. The difficulty setting can now be set to Expert. Play during this mode will allow you to play one extra stage at the end against Zhuge Liang, and the forces of Shu. This also gets you a different ending scene and the ablility to play Liu Bei Expert. This mode will also have an extra stage, but against Himiko, and the forces of Wei and Wu.

Select side:
Successfully complete the game with the Lui Bei or Cao Cao. Select "New Game" and you will be able to choose which side to be played.

Hidden battles:
After you finish the game as Liu Bei to unlock Cao Cao's side, notice that the difficulty level is set at normal instead of beginner (when you played as Liu Bei). Successfully complete the game as Cao Cao under the normal difficulty setting to unlock expert level. Select either Liu Bei or Cao Cao at the expert difficulty setting. Complete the game under expert difficulty setting to unlock a hidden battle for each side. As Liu Bei, the hidden battle is The Battle of East Lau. As Cao Cao, the hidden battle is The Battle of Chang Zheng.

Unlock 'Choose Side'
Play through the game once to get to choose between Cao Cao and Lui Bei. You can choose at the New Game screen