Cao Cao
Play the Battle Of Chi Bi level on 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.

Cao Ren
On the Siege Of Fan Castle level on the hard difficulty setting, destroy all enemy castle-attacking vehicles without the castle being compromised. Lu Meng will exit the enemy castle and attack. Defeat Lu Meng.
Note: Time will be extremely tight for this task. The following is the best order to destroy the four castle-attacking vehicles. Equipping a saddle is recommended. Immediately, run to the south wall. There will be a cloud ladder vehicle moving towards the west gate. Destroy the vehicle as quickly as possible. Then, immediately run to the east wall. There will be a cloud ladder vehicle approaching from the north. Destroy the vehicle as quickly as possible. Then, run to the stone toss vehicle at the south gate and destroy it. Next, run to the stone toss vehicle at the north gate and destroy it. Do not stop to fight enemy generals In between, as there is not enough time.

Da Qiao
Play the Battle Of Xu Chang level on the hard difficulty setting on the Wu side. Defeat Deng Ai, Hu Zhi, and Dian Wei.