Once Lara has the artifact from the stone archway, jump down to the lower floor. Be careful not to jump down into the hole in the floor.
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Go down the small hallway. Climb the stone wall ladder on the left. Go to the end of the upper walkway. We are now high up above the Pharaoh Hall. Pull the far wall lever. A cutaway scene shows the Pharoh statues moving back towards the center of the room below. Like before, the statues are on a timer and will start to retract a few seconds after the lever is pulled. Pull the lever 2-3 times and observe the way the statues retract.
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Very important to note there are stone walls jutting out that obstruct a straight route to the other high terrace at the far end of the hall. You'll have to zig-zag across. When you're ready, pull the wall lever again. Quickly run to the first statue block on the right [1]. Jump across the hall to the block [2]. Jump along the same wall to the block [3]. Jump across the hall to the next block [4]. Jump to the next block along the right wall. Now a running jump to grab the edge of the terrace. Pull up.
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Pick-up the large medipack in the corner. Walk past the iron gates on the left to the end. Pull the wall lever. A cutaway scene shows the gears locking in place on the scarab door mechanism in the sandy room below. At the same time, the Pharaoh statues in the hall have now locked in place in the forward position. Go back down the hall and jump across the stone statue blocks to the back terrace.
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Go back along the wall and down the stairs to the sandy room. Now we have to activate the scarab mechanism. Go along the left wall to the back of the room (by the iron fence). Go to the right to the stone blocks. Use the grapple and swing-run across the wall, release at the end of the arc, jump left and grab the stone wall ledge. Shimy left along the stone ledges and jump to the wing pole of the scarab mechanism. HANG-ON TO THE POLE as it drops under Lara's weight.
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The floor gives way, releasing all the sand to the floor below. The exit hallway below is now reachable. Safety drop from the floor down the stone ledges. Lean right and jump to the hallway. If you accidentally fall, you can always climb up the sandpile and jump to the hallway as well.
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