Found all the Children's Drawings

From Room 211, move through the window into Room 212, then step into the outside hall.

Defeat two Order members in the hall: one with the Handgun, the other with the Ceremonial Dagger.

Run back to the corridor leading to Sector 3, duck under the bars, and use the Sector 3 Key to unlock the door.

As you enter Sector 3, an Order member will attack.

Go to the door leading to the hallway and pry it open with the Steel Pipe.

In the Sector 3 Hallway, defeat the Order member down the west hall, being mindful of another attacking near the corner.

Duck under the barred gate; it will close behind you.

Run towards Room 320 to trigger a timed cutscene (a non-interactive cinematic the game plays automatically) where you must save Elle. If you take too long, Elle will die, and the game will end.

Quickly climb over the gate to the east, then move to the right side of the refrigerator blocking Room 321.

Push the refrigerator to move it, then use the Steel Pipe to pry open the door to Room 321.

Enter Room 321 to trigger a cutscene and face Curtis.

Boss - Curtis: Watch his Saw Blade Swing Combo and Saw Blade Thrust. Stand at a distance, attack when he recovers, and use the Ceremonial Dagger. A charged X swing can knock him down; continue tapping X to attack him on the ground. Avoid getting cornered.

After defeating Curtis, step towards the bars on the west side to trigger a cutscene.

Reenter Room 320 and pick up the --HEALTH DRINK-- and --FIRST AID KIT-- from the right counter. Examine the DOCTRINE.

Reenter Room 321 and take the ++ROOM 301 KEY++ from the key rack on the southeast wall.

Exit Room 321 and return to the Sector 3 Hallway.

Rotate the valve handle on the east wall to hold open the barred gate for Elle.

Step under the gate while Elle holds it open for you.

Move down the hallway to the east.

As you approach the door at the end of the hall, two Order members will attack. Prioritize defeating the one with the Assault Rifle.

Reenter the Sector 3 room.

Use the Room 301 Key to unlock the door to Room 301.

Inside Room 301: Examine the EXPERIMENT MEMO on the desk, the NOTE and PROPOGANDA on the table behind the curtain, and the duffle bag on the table to the north for ++ALL WEAPONS BACK++.

Collect --PISTOL AMMUNITION-- from the left cabinet on the far left, and more --PISTOL AMMUNITION-- in the cabinet off to the left in the north, past the curtains.

In the dark corridor to the northeast, take the --HEALTH DRINK-- from the back of the last cabinet and open the medical case to find a --SERUM (8/8)--.