
After obtaining the Jade Dragon secret and making your way to the top of the slope with the ramps and ledges, as shown in the last section, enter the room at the top left corner.

Pull or push the movable block with the golden face out of the doorway.

Use the switch in the next room to open a trapdoor in the floor...

...and drop in.

There's a ramp below with a metal ball at the top. It doesn't roll until Lara moves down the ramp a bit. So run/jump ahead of the ball, and when you reach the bottom of the slope, turn left.

The ball stops at the corner as you slide down the next ramp...

...and emerge in the rafters above the MECHANICAL WARRIORS.
NOTE: If you don't care about getting all kills, you can skip to the next-to-last screenshot, below.

Now, if you must have all the kills, you'll need to make a detour back through the big doors opposite the button. Do that the same way you did before. (Refer to the "UPPER LEVEL - TIMED RUN" section here if necessary).

Beyond the timed doors, head to the left and you'll see things have changed here.

Climb up into the area above the swinging spiked balls.

Follow the narrow walkway forward and kill the tiger (14) that charges from the next room.

Then continue into the DRAGON STATUE ROOM.

Use the flat brick ledges to climb back up to the room at the top left corner of the slope. Return past the movable block, through the trapdoor, and down the ramps.

When you re-emerge in the rafters above the ROOM WITH THE MECHANICAL WARRIORS (whether or not you've made the detour to kill that extra tiger), there will be 2 more tigers (15-16) lurking below. If you dangle Lara from the beams to get their attention, you can shoot them before dropping down.

Use the DRAGON SEAL in the receptacle at the the back of the MECHANICAL WARRIOR ROOM to open the door on the left.
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