Samurai Warriors: Katana (Nintendo Wii)
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Additional item slots
Enter the Buy/Ability menu. Purchasing all the upgrades for the stat in the indicated level you are in (for example, attack, defense, life, Musou) to unlock another item slot.
Third slot: Musou: Acendancy
Fourth slot: Musou: Swordsman
Fifth slot: Musou: Stealth
Fifth story
Successfully complete all four stories with a "Silver" or higher rank.
Unlock Chaos Difficulty
Complete all missions with a S rank.