The first thing to do it's going to the center puzzle and solve it, you could grab two tiles with each hand and switch it, it's easier on this way.

Then have to solve three main puzzles:

1. Red battery:

The battery it's behind one of a sofa.
You have to put the battery on the computer and put the password "SPVR17", save the red stone.


2. Green battery:

The green battery it's inside the cabinet beside the levers puzzle.
The solution of the puzzle it's:

• Lever 2: Pull 6 times
  
• Lever 3: Pull 1 time
  
• Lever 2: Pull 1 time
  
• Lever 1: Pull 3 times

Save the green stone.


3. Blue battery:

Search the blue battery on the plant and the big red stone behind the bed.

Put the blue battery on the crystal cage, the code it's 5971, slide the right door to the left, enter with the big red stone, take the blue stone and replace it with the red one. Save the blue stone.


With all stones collected, go to the cabinets, and put the stones on the next order: Red, Green and Blue.

Go through the right door.

Just go through the same previous playthrough but without solving the middle tile puzzle. And you will get the final achievements.