Step on each of the three floor tiles containing blue-gray stones (i.e., the ones outlined in the screenshot above) to open the concealed door.
Inside is a small room with a slope that meets the floor, 3 angled blocks and a small ledge above. Position Lara with her back to the slope and her chest against the side of the lowest angled block, as shown above.
Backflip onto the slope and hold the Jump key, and Lara will spring off the ramp then jump forward onto each of the 3 angled blocks in turn, landing on the ledge above.
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