Move: W/S or ▲/▼   Strafe: A/D   Turn: Left/Right arrows   Interact: E   Boost: F   Remote: R
The nursery door needs a red keycard, kept on Stinger Flynn's head. Look for his one tentacle glowing green with ladder rungs and a "CLIMB HERE" label — that's your start. Follow the labeled markers in order: CLIMB → SWING → ZIP → KEYCARD → JUMP → PUNCH his eye three times to finish him and unlock the door.
You have 60 seconds before Jumbo Josh eats your child — once the door's open, he wakes up immediately and hunts you. You're a little faster than him, but his fists hurt: two hits just injure you, a third snaps you in half. Two 5-second boosts (press F) can buy you distance.
The moment you grab your child, the facility goes into lockdown and the exit seals shut. Press R to use your remote control — it calls a drone that flies to the exit and hacks the door open for you.
Somewhere in the facility, Horrorban is hiding. Collect him and he'll follow you — if Jumbo Josh corners you while Horrorban's right there, he'll scare him off (he needs time to recover between scares).