Nobunaga's Ambition: Iron Triangle Cheats, Codes & Guides
Before You Cheat
Chiyo Yamanouchi, Goemon Ishikawa, Bokuden Tsukahara, Sukezaemon Ruson - Clear one of the 4-star scenarios in Challenge mode
Masashige Kusunoki - Clear Local mode in the Kinki region
Michizane Sugawara - Clear Local mode in the Kyushu region
Munetaka Nasu - Clear Local mode in the Sanyo/Sanin/Shikoku region
Takauji Ashikaga - Clear Local mode in the Kanto region
Tamuramaro Sakanoue - Clear Local mode in the Ezo/Mutsu/Dewa region
Yoshinaka Kiso - Clear Local mode in the Koshin/Hokuriku/Tokai region
There are four scenarios to be unlocked by achieving certain things in game. You can only unlock one scenario each time you complete the game. However, if you save right before you win, you can reload and finish again, and you'll get another scenario if the requirements were met.
Incident In Osaka - Complete a Unification scenario with the rank of "Regent."
Onin Legacy - Complete a Unification scenario with the title of "Shogun."
The Final Battle - Complete a Unification scenario with all researchable technologies researched.
To Declare War - Complete a Unification scenario while playing as the Oda clan and having viewed five Nobunaga-related events.