Part 28

Grab the Crystal Skull tied to the ropes on the watchtower on the far right side of the river.

Locate the Jade Mask behind the watchtower near where the secret gate opened in the cutscene (a non-interactive cinematic the game plays automatically) (a cinematic event).

Open the door, then kick open the chest to find the Jade Mask.

When you leave the area, kill the water sentries that appear using the Scythe.

Use the Jade Mask on the emblem on the wall to open the secret pathway in the water.

Dive down and swim to the next area (Peruvian Riverbank - North).

Emerge from the water and move forward to a dirty river.

Jump and swing on the branches above the water to reach the next area.

Upon landing on the upper dry surface, defeat the soldiers that appear.

Continue forward to a dead end with a zipline above the trees.

Jump to the zipline and traverse slowly to the other side.

Quickly move back to the dry surface to avoid rocket soldiers that emerge on the other side.

Fling arrows or Incendiary Shurikens to clear out the rocket soldiers.

Take the zipline to the other side.

Jump and swing towards the set of branches near the other side of the zipline.

Jump to a small dry surface that contains a hidden Muramasa's Statue and Crystal Skull. Grab both.

Stock up at the Muramasa's Statue.

Jump down to the water and return to the zipline from the beginning.

Take the zipline to the other side and jump down.

As you move up the short path, defeat the soldiers that appear.

Activate the Save Statue but do not save yet.

Enter the hidden area near the Save Statue (not the doorway area) to find a chest with an item.

After grabbing the item, kill the two soldiers that emerge.

Now you can save at the Save Statue.

Enter the next area to encounter Large Dung Beetles.

Eliminate all the Dung Beetles using strong combos and Ultimate Techniques (UTs).

Approach the large boulder where the bugs emerged and charge a UT to destroy it.

Jump down to the area below (Limestone Cavern).

Navigate deeper into the cavern, slicing open small caves on the left and right for Essence.

Prepare for the Bullet Worm boss battle. Stand near an open cave hole before attacking.

When the boss approaches (indicated by a sound like a speeding train), unleash a level 2 Ultimate Technique, preferably with the Eclipse Scythe UT, into its face.

Immediately evade into the nearby cave hole to avoid its tongue and spackle attacks.

Repeat the process of using a UT and evading until the boss is defeated.

After the battle, jump down the chasm to find a Save Statue.

Upon entering the Pond Scum area, avoid battling the worms that pop up from the water.