Start by going to The Electric Chair - you need to active it by flipping all the levers up, which can be achieved from one starting position by flipping levers 1, 2 and 4. If this results in all levers down, just flip levers 1 and 3 to complete the puzzle Shocking. You can now pick up the first crystal (1/7).
Now turn around and approach The Guillotine - you need to solve a peg-jumping solitaire puzzle. Number the pegs as in the diagram below:
Move the pegs in the following order to be left with only one on the board: 8-6, 2-8, 1-5, 6-3, 5-1, 10-5, 9-3, 1-5 Don't lose your head. You can now pick up the second crystal (2/7).
Go over to The Execution of Louis XVI and read the plaque. Look at the nearby puzzle called "RIP Louis XVI" and enter the year of his death, 1793 Louis XVI. Head through the opened door to a new area.
Go to the far right corner to find a tilting platform puzzle. You need to tilt the platform to roll the ball around and hit the 5 towers Tilted. Once done, collect another crystal (3/7).
Next go to Mayan Number Glyphs. Read the plaque, then use the device. You need to flip the white symbols to black to indicate your selections, and translate a series of 4 numbers (indicated by the sum of 2 dice) into the Mayan number system Number translator. The door here will open when you are done, so head on through.
Go to the further room and find a sliding tile puzzle on the wall to complete Tilted. Once done, you can collect the next crystal (4/7). Return out to the previous area.
Go around the central structure to the opposite door. For this puzzle, you just need to create a single path from bottom left to top right, using all tiles except the circles Heartless:
Go through the door here when it opens.
Make your way through the bunker until you find Secret Communications. Approach the table and use the machine. You can spin the dial in the middle, and then read characters either to the left or the right. The code L6.R2.L0.R4.L6.L9.R5 decodes to AIRRAID. Enter this using the spinners at the top Message received. Pick up the next crystal (5/7).
Press the green button next to the door here and it will open to let you back to the first area.
Turn your attention to the other closed door just to the left. You need to spin the 6 dials so that adjacent skulls have the same colors. The picture below shows the colors of the skulls that should point towards the central dial Put our heads together:
Go through this door to a new area.
Go around to the left to find Cremation. Examine the red and blue pipes here. All you need to do is swap the position of the red and blue discs within 7 moves It's hot in here. Collect another crystal (6/7).
Head to the other side of the room to see a 3x3 grid of runes, where you can spin the middle column. The top row are displayed on a building in this room, and the bottom row are displayed on the wall back in the Execution exhibit. Try all possibilities for the middle row to get the correct combination Runed. Go through the opened door.
Find a poster on the wall that has the numbers 18, 27 and 62 on it. Now go over to the medical equipment drawers and pull out all drawers except these three We did everything we could. Now pick up the final crystal (7/7). Return to the previous room.
Go straight across to the opposite closed door. Look at the jigsaw puzzle to the right of the door and solve it by swapping pieces to recreate a pile of skulls Bone fragments. Head through the opened door.
Place the 7 crystals on the receptacles, then pass through the portal We forgot our handbook.
Go up to the desk and open the book for a clue to the final puzzle. Approach the clock and open the glass panel. Now pull the 3 controls in this order: left, right, middle, right. Once you reach the outside, open the gate to leave Not today.