Tower

The Tower, also called the Great Tower and other similar names, is the central structure in the Simulation. Throughout The Talos Principle, the player (Athena) is warned by Elohim that ascending the tower will lead to the player's death (in reality, ascension will lead to Elohim's death and to Athena's consciousness being transferred to the physical world).

The elevator in the tower can take the player to floor 1 as soon as the tower itself is accessible (that is, after leaving the Land of Ruins), but all other floors requires first using a terminal within the tower. For floors 2 through 5, this requires using the terminal on the previous floor, which is accessible only after completing a puzzle. Floor 6 can be enabled from any tower terminal but only after learning the required three-digit code, which is randomized for each playthrough of the game.

Star

A star is visible in a small building behind the tower. It is locked behind a blue door that can only be opened by connecting a laser to a receiver.

If you can't find the blue emitter:

[ hint ]

It is initially only partially visible from the area around the tower. Something is blocking it.

If you want to know exactly how to access the emitter:

[ hint ]

You need to break the wooden fence at the back side of the tower, using the axe from inside Building C.

If you don't know where to get connectors:

[ hint ]

You can take two connectors from the puzzle on floor 2 and dropped them off the edge of the tower (or take them down in the elevator).

Floor 3

Star

A star is visible on this floor behind a wall.

A small hint:

[ hint ]

You cannot access the star from floor 3.

To know where to begin:

[ hint ]

You need to go to floor 5.

The solution:

[ hint ]

From floor 5, instead of entering the puzzle, walk through the large opening onto a ledge along the wall of the tower. Drop down to another ledge, then walk out onto a plank that extends perpendicular to the building. From the end of that plank you can drop down to part of floor 3 that has the star.

Floor 6

This floor contains only a tetromino arranger and a portal to the messenger ending.