Cao Cao: Level 10 weapon:
Play the Battle Of Chi Bi level under the hard difficulty setting with Cao Cao. First, approach Pang Tong to see through his trick, then defeat Zhuge Liang to stop the wind prayer. Next, defeat Gan Ning and Lu Meng to trigger the all out attack. Then, defeat Huang Gai to stop the fire attack. Finish the level with your level 9 Sword of Heaven to get Cao Cao's level 10 sword.