Catch a blue-painted box before it touches the ground
In Chapter 6, you will come to a test chamber that has a glass case in the center of the room with a box inside it. To get this, you need to drop the propulsion gel on the box so it bounces and breaks the glass and then catch the box before it hits the ground. The easiest way I found was to drop the propulsion gel on it a bit at a time and then quickly drop water on it to stop it from bouncing. Keep repeating this until the box breaks the glass to create an opening and then jump and pull the box out.

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