All characters
At the title screen, press Square(2), L1, L2, R1, R2, Square(2) to unlock all nineteen hidden generals.
--------------------
Sent in by Kerley

All Shu Generals
At the title screen, press Square, R1(5), R2(2) to unlock all Shu Generals.
--------------------
Sent in by Kerley

Edit mode
Successfully complete musou mode with all characters except Dong Zhuo, Diao Chan, Lu Bu, Yuan Shao, and Zhang Jiao to unlock edit mode in the options menu. Alternately, press L1, L2, R2, R1, L1, L2, R2, R1 at the title screen.
--------------------
Sent in by Kerley

BGM Test Option
At the title screen, press R1(2), R2(2), L1(2), L2(2) to unlock the BGM test selection in the options menu.
--------------------
Sent in by Kerley

Alternate introduction sequence
Successfully complete musou mode with any character.
--------------------
Sent in by Kerley

Unlock Huang Zhong, Ma Chao, and Jiang Wei
Successfully complete musou mode with Zhang Fei, Zhao Yun, or Guan Yu.
--------------------
Sent in by Kerley

Unlock Xiahou Yuan and Zhang Liao
Successfully complete musou mode with Xiahou Dun, Dian Wei, or Xu Zhu.
--------------------
Sent in by Kerley

Unlock Taishi Ci, Lu Meng, and Gan Ning
Successfully complete musou mode with Zhou Yu, Lu Xun, or Sun Shang Xiang.
--------------------
Sent in by Kerley

Unlock Zhuge Liang
Successfully complete musou mode with Zhang Fei, Zhao Yun, and Guan Yu.
--------------------
Sent in by Kerley

Unlock Liu Bei
Successfully complete musou mode with Zhang Fei, Zhao Yun, Guan Yu, Huang Zhong, Ma Chao, Jiang Wei, and Zhuge Liang.
--------------------
Sent in by Kerley

Unlock Sima Yi
Successfully complete musou mode with Xiahou Dun, Dian Wei, and Xu Zhu.
--------------------
Sent in by Kerley

Unlock Cao Cao
Successfully complete musou mode with Xiahou Dun, Dian Wei, Xu Zhu, Xiahou Yuan, Zhang Liao, and Sima Yi.
--------------------
Sent in by Kerley

Unlock Sun Jian and Sun Quan
Successfully complete musou mode with Zhou Yu, Lu Xun, Sun Shang Xiang, Taishi Ci, Lu Meng, and Gan Ning.
--------------------
Sent in by Kerley

Unlock Lu Bu in free mode
Successfully complete Stage 2 (Hulao Gate) in musou mode with at least 1,000 KOs.
--------------------
Sent in by Kerley

Unlock Diao Chan, Dong Zhuo, Yuan Chao, and Zhang Jiao in free mode
Successfully complete musou mode with at least one member of each kingdom.
--------------------
Sent in by Kerley

Unlock Side Selection in free mode and BGM test option
Successfully complete musou mode with at least one member of each kingdom.
--------------------
Sent in by Kerley