The excitement in this game never ends up. You will face much more adventurous situations and things that need to be done. One of those things is to solve the switching puzzle from chapter 8 which can be very simple if you do the right things. To be done with the ASAP and free Jacob, follow the instructions given in this guide.
The Quarry: Chapter 8 Switch Puzzle Guide
In the beginning, you will need to go through the first door in front of you and to open it you will need to press 2 & 3.
After you do that your next move will free Jacob. Press 1 & 2 to free him.