Why do I need several objects?

Each object provides only a brief breath, so the girl needs the whole chain.

What is the towel for?

Pull it over the boy's head so the girl can surface unseen.

Slide open the blue window, then drag the bird from the branch onto the submerged girl's face.

Brain Puzzle: Tricky Quest level guide

hard

Feed the submerged girl air from the duck, straw, pipe, mask, bottle, darkness, and bird until the boy leaves.

If the player asks you to sign in, open the video on YouTube instead.

Give the yellow rubber duck to the submerged girl.
Drag the straw from the orange drink to the girl.
Give her the loose white water pipe and then the diving mask.
Pull the white towel over the boy's head.
Drag the yellow shower-gel bottle from the shelf beneath the shower to the submerged girl's face so she uses its trapped air.
Turn off the bathroom light so she can surface unseen.
Slide open the blue window, then drag the bird from the tree branch into the bathtub and onto the girl's face for the final breath.
Wait until the boy leaves and the girl surfaces.

Board notes 5 details

Layout: A girl hides underwater in a bathtub while a boy searches among several usable bathroom objects.
Goal: Keep the girl breathing without letting the boy find her.
Opening: Use the rubber duck and drink straw as the first two air sources.
Danger Zone: Each object supplies only a short breath, so the full chain must continue.
Mechanics: Air-bearing objects and sight-blocking distractions extend the underwater hiding timer.

Why do I need several objects?
Each object provides only a brief breath, so the girl needs the whole chain.
What is the towel for?
Pull it over the boy's head so the girl can surface unseen.
What is the final air source?
Slide open the blue window, then drag the bird from the branch onto the submerged girl's face.