Samurai Warriors 2 - Extreme Legends - Platform: Playstation 2

Kojiro Sasaki's fourth weapon:
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The quest for Kojiro's fourth weapon is in his fourth stage in Story mode. In 
order to unlock his weapon, you must clear 300+ kills as well as kill all 
Vagabonds (including any that spawn), help the Ieyasu retreat, kill Hideyori, 
and reach the southeastern gate within ten minutes. To do this, you will need a 
fast horse and a decently leveled Kojiro. At the start of the battle, clear all 
the Vagabonds around Ieyasu. Then, run back and clear the escape point. Wait for 
two more Vagabonds to appear. Kill one, which will cause at least six more to 
appear. Kill them, and wait for Hideyori to spawn in the southeastern maze-like 
area. Find and kill him, then quickly go to the southeastern gate. Musashi will 
appear in a short intermission sequence. A notice will then appear, showing you 
the location of your new weapon. Make sure to get your new weapon before killing 
Musashi.