Level 21
The next room is a maze. Just follow the only route. Where necessary, jump down. At the end there will be a dilapidated bridge. In its parts, you can jump (even where the shadow).
Level 22
Go to the remote control and click on it. Two platforms will arrive, and there will be a second spotlight on the far one. Install the first spotlight on the near so that it illuminates the path for the distant platform. Run to the far platform and aim the second spotlight at the remote on the left. Click on it. The platform will drive off, and the spotlights will light your way. Get to it and shine to the right, on the first searchlight. Jump to it and turn it to the left to get to the stairs. Go up.
There are four platforms on the top floor, and they all move clockwise. Install the spotlight on the nearest platform by illuminating the second spotlight in the distance. Run to it and turn left, towards the remote control. Click on the remote. Spotlights will shift. Run to the second spotlight, point the first at him. Turn it to the right, but remove it from the platform. Follow the right along the corridor to the remote control. Press it twice so that the first spotlight comes to you (the second will be motionless and will continue to illuminate you). Use the first spotlight to get to the exit.
Level 23
On the right, find the window and jump through it to the console. Call the elevator, but it will fall down. Jump into the mine, move through the ventilation and soon find the fourth recorder. Light the first spotlight in the second. Install the second one on a moving platform so that it faces the first. Return to the first and install it on the nearest platform, but point to the right. Move to the remote control and click on it. When the platform arrives, the second spotlight will illuminate the first. You will have to turn it to the right and move forward through the pipes.
You are back. Jump on the dilapidated bridge and on the right you will find a closed door. When Virgil finishes, it will open.
Level 24
Continue through the laboratory, press the remote control and pick up the photon connector. You will receive the achievement. You will understand how this device works. Go around the source clockwise, but pay attention to the columns rising and falling. They can block the path to the connector, it goes out and you die. When you reach the second column, stand on it when it is lowered to go up.
Go to the right so that the light touches the distant photon connector. Run to it, pick it up and move forward to the first connector. Turn to the glass on the left so that the connector is in contact with the source. Return to the first connector; go up with it up on the second column. Thanks to the connector on the glass on the opposite side, you can go further. Leave the connector and jump over the cliff.
Level 25
Lift the nearest connector on the stairs to the right, to the second. Move the second connector to the very depths, to the corner, so that the remote is to the left of it. Return to the first and move down and to the right, along the other stairs. Through the first connector, light enters the second. You light up the remote. Interact with the remote to bring up the platform. Move the second connector to the right of the remote closer to the remote (and glass). Carry the first connector down to the platform and move on it. Due to the connector at the console from above, you can take the connector, which was delivered on the platform, and illuminate your path. Upstairs, you will also need to illuminate the broken bridge, and then jump over it.
Level 26
On the platform, move forward, pick up the connector and go back on the platform. Move the connector to another platform and drive forward on it. There is a second connector to the left of the wall. Move it forward so that it is in line with one of the platform stopping places. Go back on the platform with the connector. Get off it and run back to the second connector (leave the first). On a platform with a source, move right. The light will fall into the second connector and from it into the first. Follow the first through the second and move closer. Use the first one to get to the exit.
Level 27
There are two connectors. Take the far one to the very end of the path, to the cliff, but set it so that you can return to the source. Carry the second connector through the offices. The distant connector is useful where direct visibility with the source is lost. So you get to the cliff at the second connector. Put the first and jump to the second. Take it the same way to the first (through offices). In the future, everything is simple.
Level 28
Take the nearest connector and go up with it to a large platform. Lower the connector to the other side, at the entrance to the dark corridor. Slide the platform by pressing the remote control and follow the connector to which the light will fall. Drag it forward along the corridor so that he contacts the second connector in the office on the right. Remove the second connector from there. Take both to the platform and move to the right. Lower one to the source, the other to the corridor opposite. Slide the platform so that it does not block the light, and use the distant connector to get through the dark office.
Level 29
Open the door to the right by pressing the remote control. Click on it again and run into the corridor until the door closes. Virgil will comment on this moment, and you will receive the achievement. Move to the connector in front. Together with it, go to the connector in the corridor on the right. Then press the remote control, but have time to return to the connector inside, until the door is closed. Take both connectors to the adjacent corridor, opposite the light source. From the source, jump to the right, go up and open the door, create a short path.
Go down; press the remote control to open the corridor with two connectors. Take one of them all the way forward, the other – all the way to the right. Go back to the first and bring back into the corridor. Close it and climb the ledge on the right, through a short path. Take the connector to where it was to apply light to the distant connector. Get to it in the usual way, through a short path, and go forward along with the connector. Climb onto the ledge.
Level 30
Take the connector and go right along the corridor. Activate the remote control twice and get to the third connector in the room on the right. Put it on the edge of the platform. Rotate in such a way as to deliver the third connector to the place of the first (where it was originally). Then rotate the platform so that this third connector is already on the other end of the L-shaped bridge. Go back to the console along the bridge and turn it so that the bridge connects the place you came from and the new path opposite the console. Take the first connector; go back to the place from where you came to give light to the other two connectors. Follow forward.