The Medium Thomas’s Hidden Room: How To Solve The Picture Developing Puzzle

While trying to find Thomas in The Medium, after you reach his office and solve the Clock Puzzle, you’ll enter Thomas’s hidden room, where a new puzzle awaits; but unlike the previous one, it is a bit easier.

Your objective is to search the hidden room, and if you take a look around, you’ll notice that this room is, in fact, a darkroom quite similar to the one you found in Jack’s House.

Or simply put, Thomas’s hidden room in The Medium includes a puzzle that is almost identical to the one from Jack’s darkroom.

If you missed Jack’s puzzle, that’s ok because the only thing you missed is actually a collectible. But Thomas’s hidden room puzzle is mandatory, meaning that you’ll have to solve it if you want to progress the story in the video game developed by Bloober Team.

And that’s exactly what I am going to show you below. How to search the hidden room in The Medium, and how to process a picture that will help you move forward with Marianne’s incredible journey.

How To Search The Hidden Room In Thomas’s Office

The first thing that must be outlined here is that although your objective asks you to search the hidden room, in fact, all you have to do is to find several objects and use them to solve a puzzle.

These objects are a tray and some substances you need to process a picture or a Photo Paper. As such, in order to keep this Medium guide to the point, everything that is not included in the list below is not required for the actual objective.

So let’s start with the objects required for our puzzle, then I’ll tell you how to complete it.

The first substance you need to get is the Fixer. It’s sitting on a chair next to the workbench or the table where you’ll develop the picture. You can see it below.

The Medium Fixer Location
Get the Fixer first

Next, head towards the bookshelf and get the tray in the white plastic crate. It’s on the ground, on the left side, just like in my screenshot.

The Medium Hidden Room Tray Location

Third, you’ll need a Multigrade. The bottle containing this substance is on the right side of the same bookshelf.

It’s pretty easy to spot if you move several steps from the previous item.

The Medium Multigrade Location
Get the Multigrade from the library

Finally, you need one last substance called Stop.

Return to the workbench, and you’ll find it in the sink on the left side.

The Medium Hidden Room Puzzle Guide
Last but not least get the Stop from the sink

These are the key items you need to move forward with the story; but obviously, you should fully explore the hidden room if you want to find collectibles and other clues; including some interesting books.

How To Solve Thomas’s Office Hidden Room Puzzle

Good, so now that we have all materials, it’s time to process a new photo.

The first thing you’ll want to do is to head back to the working table and turn on the red light. This step is mandatory, as the note on the wall tells you.

Once you do that, place the tray you found in the empty slot.

Now, you’ll want to fill all three trays with the substances mentioned above.

To keep things easy to track, just use the substances in the exact same order, as mentioned below (from left to right):

  • Add the Multigrade to the first tray on your left
  • Add the Stop in the central tray (the one you have found)
  • Finally, add the Fixer in the third tray (the one on the right)

When you are done, your working table should look like this.

The Medium Hidden Room Puzzle Solution
Ready to start the developing process

How To Develop/Process The Photo Paper

With all substances in place, let’s see what you have to do to process this new Medium Photo Paper.

First, pick the Photo Paper from the stack, then place it on the wooden board (pictured above).

Press the button on the device and count to 5. Pay close attention to the distinctive sound in the background. When you counted to five, shut down the device and pick up the Illuminated Photo.

Place the Illuminated Photo in the first tray on the left. It contains the Multigrade; however, the moment you place it inside, count to three, then pick up the Multigraded Photo.

Keep in mind that you have to keep the paper in each tray for exactly 3 seconds. Just count to three, and you’ll be fine.

Now, sink the Multigraded Photo in the second tray from left to right. Or the one in the middle. It contains the Stop substance. Again, count to three and pick up the Water-bathed Photo.

Finally, place the Water-bathed Photo in the last tray, which contains the Fixer. Count to three, and you’re done.

Obviously, you won’t see the face in the picture, but you’ll start a cutscene at the end, of which you may want to get ready for some running.

And that’s it! That’s how you solve The Medium Hidden Room Puzzle.

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