
The following yellow essence exploit can be completed on the game’s very first chapter, and is especially useful when playing on Master Ninja difficulty. Before and after crossing the bridge, you’ll deal with enemy ninjas (it’s the bridge where the first God of Life and a treasure chest can be found). After you cross the bridge, defeating ninjas as you go, head towards the middle alley that brings out two more ninjas on foot and another two ninja archers. Run back and charge up to Ultimate Level 2. Continue to run back and forth, and the ninjas will keep respawning and coming at you. If you have the skill, getting away with $40,000 while having 50%-75% of your health still available to you is a possibility.
Another technique from davidlaughs.
There’s a walkway below an area where you have to swing across a pipe. You’ll run into two more, and then reach a save point. This is where the exploit can be found. Drop down below the save point and a group of five bad guys will attack. Kill all of them, climb up the ladder and head to the first pipe. There, drop down and you’ll be confronted with another wave of enemies. Repeat this process over and over again for as much essence as you want.
In the game’s third chapter, you will be on the streets of New York. Near the beginning of the chapter, you will drop down into a sewer and fight there for a while. When you reemerge back on the streets from your brief sewer battle, an alley with a treasure chest at the end of it can be found. Right next to the chest is a building that says DOATEC in huge letters. DOATEC is the evil corporation that you do battle against in another Tecmo game, Dead or Alive 4.
Here’s a great way to farm Yellow Essence during chapter two. After ridding the bridge you encounter of all of the archers and acquiring the Crystal Skull there, you will have to continue down another wooden path. This will lead to a pair of chasms that you have to swing over to get to the save point. Below that is a lower walkway full of enemies. Kill them all, and then scale a nearby ladder to reach the upper area again. When you go back down, the enemies will have respawned. You can kill them again to grab their Yellow Essence, climb back up, jump back down, repeating this ad infinitum to get all the Yellow Essence you want.
This exploit works during the sixth chapter, entitled The Lycanthropes’ Castle. After you fight the Giant Skeleton miniboss, you will be thrust into a battle with more Scorpion Skeletons. Fight them and wall run up to the next floor thereafter. Then, drop back down, fight them again, and repeat this process as much as you’d like for an infinite number of Yellow Essence.
Below are a list of some of the weapons in the game, and where in the game they can be acquired.
To unlock a filter that will make the game appear to be an old film, beat the game once through in its entirety.
To unlock a New Game+ option, beat the game once through in its entirety, being sure to save your game after watching the ending and credits.
To unlock an in-game music player where you can listen to all of the game’s music in one place, beat the game once through in its entirety.

To unlock special camo ninja gear for Ryu, complete the game once through on at least the Warrior difficulty setting. To unlock some red ninja gear for Ryu, complete the game once through on at least the Acolyte difficulty setting.