After each chapter, your performance is evaluated based on several factors, culminating in a 'Karma' score and a rank (from Ninja Dog to Master Ninja). Factors include enemies killed, time taken, damage taken, and Ninpo used. Achieving higher ranks unlocks bonuses and is a testament to your skill. Don't be discouraged by lower ranks initially; focus on improving your combat efficiency and minimizing damage. Replaying chapters is an excellent way to refine your techniques and aim for that coveted Master Ninja rank, which often requires perfect play and efficient enemy clearing.
