Kessen 2 Cheats - PlayStation 2

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.

Dynasty Warriors 4 reference
During the FMV sequence where the two men are talking amongst themselves about Cao Cao and Liu Bei, zhao yun is sitting there listening. Look behind him to catch a glimpse of the character Gan Ning from Dynasty Warriors 4 going to sit down. What makes this unique is that the Gan Ning in the game is totally different looking.