NINJA GAIDEN Σ

As these all stack with difficulty and there is one for getting Master Ninja on all chapters on Master Ninja, I advise against trying to get all of them individually, even if you are playing through on each difficulty. On the chance that you are though, here are some general tips.

Aim to complete each Chapter in under 30mins, unless that Chapter contains an Ambush (Chapters 3, 5, 7, 8, 9, 12, 14, 15, 16). For each Ambush present, add 10-15 mins to the target time. Some long Chapters with Ambushes still get the 100,000 bonus Karma at 1hr.

If there is an Ambush present, complete it, as you will not have enough kills to earn the 100,000 Kill bonus if you do not, unless you farm an Ambush worth of kills with respawning enemies.

Try not to buy anything at Muramasa unless you feel it is essential, or know you will make the money back somewhere. Always try and end the level with more Yellow Essence than you started. The Armlet of Benediction and the Holy Gauntlet boost Yellow Essence orb values, while ETs and UTs earn more per kill than just regular combos (and also stack with the Armlet and Gauntlet).

Finish the Chapter with full Ninpo. The bonus for Ninpo is awarded as a percentage, so having 1 of 2 (50%) Ninpo loses you 50,000 Karma, but having 4 from 5 (80%) only loses you 20,000 Karma. If you need to use Ninpo against a boss, refill it with items before landing the killing blow. Especially on lower difficulties where items are cheaper, you can easily replace the ones you used to make sure you got a maximum bonus.