After killing the mummy (10) on the stairs, using the switch to drop the BRIDGE TO THE ANKH artifact, and picking up the medi pack and ammo (11-13) on the ledge below the switch, as described in the main walkthrough, continue to the top of the stairs, where the mummy came from.
Here you'll find a gold door, which you can't open yet, and an opening in the floor in the far corner by the windows overlooking the OBELISK. Drop through the opening...
...and slide into the room below.
This tall room contains not only the slide you just came down, but also a block staircase and another slide high above, which can be changed back and forth from slides to staircases using a set of switches.
A panther (11) spawns when you enter the small room with the two doorways opposite the end of the slope.
To avoid being mauled, climb into the first raised opening in the wall to the right (i.e., right when Lara's back is toward the slide).
The panther will then emerge and you can shoot it from the safety of the alcove. When the cat's dead, use the switch in the alcove to change the slide into steps.
Go into the room where the panther came from and pick up some more magnum ammo (14).
Return to the big room. Climb to the fourth step...
...and jump over to the ledge on the left. Pick up the shotgun shells (15).
Either take a carefully angled running jump onto the blue platform between the support pillar and the steps, or jump back to the steps, climb up twice more, then drop down onto the blue platform. (NG+ players will find another save crystal here.)
Go through the doorway on the right to emerge on the east side of the OBELISK WITH FOUR DRAWBRIDGES.
Turn right. Halfway up the stairs you'll find a large medi pack (16). At the top is another switch. Use this to change the second (middle-level) slide in the previous room into steps, but don't return there yet.
Instead, turn around so the switch is behind Lara and then hop down onto the ledge directly ahead. Go through the doorway on the right, opposite the SCARAB. (This bridge is still raised.)
DARK MODE: Even with brightness adjusted, dark images on a light background can be hard to see. May I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's web store.)
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