Take a running jump across the excavation pit. You're aiming for the square ledge on the other side a little to the left. Turn left (north) and take a running jump to the next ledge. Take a standing jump up to the next flat block, where you'll need to kill a giant beetle.
Climb up two tiers on the side of the pyramid.
Then take a diagonal standing jump to the next flat spot above and to the left.
Take another diagonal standing jump to the next flat ledge above and to the left. Wait for the falling blocks to come down before walking to the left side of this ledge. From there, take another diagonal standing jump to the next flat square above and to the left. Kill the 2 giant beetles that fly out of the doorway.
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