Jump to grab one of the lowest handholds on the side of the tower. When another handhold passes above Lara, jump up to grab it.

Wait until the next ring brings a narrow ledge above. Jump to grab it and pull up to hug the wall.

Jump to grab the horizontal pole as soon as it passes above Lara's head, but do not pull up yet.

There are holes that spurt steam that can hurt Lara and make her lose her grip and fall down. If the latter happens, Lara will first hang with one hand before falling down, so quickly press the Intercat button to make Lara hang with both hands. While hanging from the pole, climb on it as soon as the steam hole passes above. Turn to face the tower and jump to grab the narrow ledge above.

Pull up to hug the wall and quickly jump straight up to grab the horizontal pole before the steam hole reaches you.

Climb on it and turn to face the tower. Jump up to grab the narrow ledge above and pull up to hug the wall before the steam hole reaches you. Jump up once more to grab the horizontal pole and traverse away from the tower until you reach the middle of the pole.

Climb on the pole and jump to grab the circular ledge above; pull up. Go around the ledge and get two Treasures (5 and 6/30). One of them is hidden in a vase.

Then grab onto the symbol that glows when Lara is nearby and move to the left. When the symbol reaches the same one designed on the floor, a fourth ray of light falls from the ceiling in front of the door.