The Anthem of Babel, as a decryption game that translates various languages, has players deciphering all sorts of mechanisms on different floors. The map design of the fourth floor is quite intricate, and many players cannot find the portal on this floor. Therefore, some people may ask how to clear the fourth-floor portal in the Anthem of Babel? Here, I will provide the thought process for clearing the fourth-floor portal, helping players find the final portal.

First, players come to the entrance of the laboratory, where they will find a text on the wall. Players need to decrypt it, matching all the textual content in the image. After matching, the blue door will open, and at this point, a crowd will have gathered at the entrance, and the player needs to walk in.
After entering, there is a cafeteria, with NPCs eating inside. The player needs to go up to the second floor of the room. The second floor is a large library with many books, mainly about cooking. Players need to find the corresponding characters to match the content. At this point, players can get the next clue, which is mainly a fun game requiring them to throw all the props shown on the TV.

Once everything in the machine is gone, the puzzle is unlocked, and the passage to another floor opens. Players need to enter this floor, where there is a pipe and a moving walkway. Using the power of the moving walkway, players can directly go down.

Following the path of the moving walkway, players find an unactivated door, which is the location of the portal. After activating it, players can enter the portal area, but the device inside is not fully activated yet, with a large control panel present.
Using the control panel, players will see a mechanism similar to a press, requiring them to place all items from the third floor onto the first two floors. This mechanism can then be activated, allowing players to smoothly enter the fifth floor.

This is all the information provided by me on how to clear the fourth-floor portal in the Anthem of Babel. There are quite a few locations to pass through on the fourth floor, and players need to try to decrypt all the elements to activate the final portal and proceed to the next floor.