From The Talos Principle Wiki
Identifier: North 3-1
Area: Lost Marshes
Puzzle Type: Main
Previous Puzzle: None
Next Puzzle: Possibilities

Substitution is the first main puzzle in the Lost Marshes area of The Talos Principle 2.

Puzzle elements


When you enter the puzzle, you see an active detachable fan pushing up a hexahedron against a horizontal blue door. There is a swapper on the side with a jammer in it. The progress wheel is visible on a ledge, about a floor above the blue door.


A basic hint:

[ hint ]
This puzzle teaches you the properties of a swapper. You have to bring some equipment to the swapper in order to get the item in the swapper. In such puzzles, it is important to figure out what puzzle element you require right now, and to identify when the use of such element is done, and it can be swapped back for the other item.

If you're struggling to get started:

[ hint ]
Notice that the fan is detachable.

If you're wondering what the use of the hexahedron is:

[ hint ]
It is a good thing to have some useless items, because those can be fed to the swapper.