Select either Liu Bei or Cao Cao, and successfully complete the game on the 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.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1645EBB30C0BF9CF F88D2FBF
Liu Codes
Max Troop Strength 1C609690 F8FCFE66
Max Supply 1C609691 F8FCFE66
Max Technology 1C609692 F8FCFE66
Super Troop Strength 1C609690 F8FCFE84
Super Supply 1C609691 F8FCFE84
Super Technology 1C609692 F8FCFE84
Cao Codes
No Troop Strength 1C609694 F8FCFEFE
No Supply 1C609695 F8FCFEFE
No Technology 1C609696 F8FCFEFE
Max Troop Strength 1C609694 F8FCFE66
Max Supply 1C609695 F8FCFE66
Max Technology 1C609696 F8FCFE66