Ayame’s & Rikimaru’s Ranking System

At the conclusion of each mission your ninja techniques are reviewed. Your score and rank will depend on how many enemies you killed and under what circumstances. If you score a high rank your ninja items will be increased. Score the highest rank, Grand Master, and you will be rewarded with a special Grand Master item per mission.

A break down of the scoring system and ranking for Tenchu: Wrath of Heaven when playing with Ayame or Rikimaru is given below. Tesshu’s Ranking System can be found here.

Task Breakdown Points
Undetected Kills Undetected kills + 20 (for each)
Detected kills Detected kills +  5 (for each)
Spotted Finishing mission +300
Spotted – 30 (for each)
Not spotted bonus +150
Innocents Innocent kills – 50 (for each)
Points Rank Items
 < 100 Novice 3 random ninja items increased
100 <  < 250 Thug 5 random ninja items increased
250 <  < 350 Ninja 8 random ninja items increased
350 <  < 450 Expert Ninja all ninja items & 4 random special items increased
 > 450 Grand Master all ninja & special items increased

The fact that you only need 450pts to gain a Grand Master ranking allows you to deduce two formulae regarding how many times you can be spotted and still gain the highest rank. Suppose a mission has x  enemies. Then use these formulae to check how many times you can be spotted, s :

Formula 1 < 20x  – 150
45
Formula 2 < 20x  – 150
30

where Formula 1 calculates assuming you normally kill any enemy who sees you, and Formula 2 assuming you stealth kill any enemy who spots you. Note these formulae assume you kill every enemy on the level.