The Bridge of Many Sides

This area has deadly saw blades that move around when you do. But before moving, take the Emerald from the pot in the far upper-right of the screen. Head up the wall and around.

The saw blades, moving as you do, will hit you if you continuously move. So move back twice to make the saw blade move out of the way and you may continue. This next stretch shows that you will have to use the saw blade to kill the snake. Move forward and drop down on the wall. Stop on the crack and collect another Twin Snakes fragment from the side of the pillar that holds the wall you are on.

Flip the brown lever to move the platform with the saw blade in place. Move once to the right and back to kill the snake and make the saw blade move forward. Continue on to the next area.