Ki ( Ki?) is spiritual life energy that ninja and other beings use to perform various supernatural effects, including the casting of Ninpo or performing more physical techniques.

Classic seriesEdit

Ninja GaidenEdit

In the NES Ninja Gaiden "ki" appeared as Spiritual Strength and was represented with (Shinobu) and a number. Each technique or ninpo equipped costs a set amount of ki. To recover his ki, Ryu Hayabusa must collect spheres marked with 忍, which come in two varieties: blue which recovers 5 and red which recovers 10.

Item 忍 Cost
Throwing Star 3
The Art of the Fire Wheel 5
Windmill Throwing Star 5
Jump & Slash Technique 5

Ninja Gaiden II: The Dark Sword of ChaosEdit

Ninja Gaiden III: The Ancient Ship of DoomEdit

Ninja Gaiden ShadowEdit

Ninja Gaiden XEdit

Modern seriesEdit

Ninja GaidenEdit

Ninja Gaiden: Dragon SwordEdit

Ninja Gaiden IIEdit

Ninja Gaiden 3Edit

Standalone gamesEdit

Game Gear Ninja GaidenEdit

Master System Ninja GaidenEdit

Ninja Gaiden ClansEdit


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