NOTE: The "Ghost of the Louvre" achievement/trophy requires you to complete this level in stealth, so that's what we'll attempt here. The main walkthrough includes a few additional notes. We'll also unlock "Corner Frag" in the process.
After examining the latest notebook entry (32/62), climb the stairs cautiously.
As you approach the second landing, Lara says, "I have a nonlethal weapon. This will help me get past the guards." Indeed, tasing certain enemies will be crucial for stealth. Stop on the stairs just below the second landing.
Open Inventory, then Weapons, and equip the K2 Impactor.
A museum guard (1) with his own taser moves onto the landing above, stopping beneath the security camera to look around. He may take a few steps down toward you. Just stay out of sight and wait for him to return along the hallway to the right. Then move up the stairs and stop before the third landing.
Wait for the camera's sweeping red beam to move away from Lara.
Then quickly run around the corner. If she's caught in the beam, you fail.
NOTES: The door beneath the security camera can be opened but only after a strength upgrade. Just ignore it for now. Also, try to avoid tasing the first guard so he falls under the camera or on the stairs. This can make it impossible to pick up the ammo he drops. If the first guard spots Lara, if you use a regular gun without a silencer, or pass under the camera, a second guard (2) appears at the top of the stairs, and you'll need to deal with him.
Continue up the stairs, around the corner, and up the next flight of stairs.
Here the camera shifts to show another guard on patrol outside the window. We'll meet him later.
If Lara bugs out and her arms go sideways, aiming for enemies you can't see, just holster your weapon until you actually need it. Continue up the final staircase, following the guard, but don't tase him yet.
At the top of the stairs, go into stealth mode.
Step into the doorway, face right...
...and press Action to hug the doorframe. With taser drawn, press Left to lean out around the corner...
...then quickly fire to subdue the guard before he notices Lara. This should unlock the "Corner Frag" achievement/trophy.
Press the Stealth button again to return to normal. Pick up the Impactor battery (1) the guard dropped.
and continue around the corner to the end of the hallway.
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