The first step is to find the path through the maze. We can safely ignore the thickness of the walls while doing this.
The letters along the path spell out INFINITY STONE CONTAINER OR A WRINKLE IN TIME. This is a reference to the cube which held the Space Stone in the Marvel Cinematic Universe movies, or the method of travel in Madeleine L’Engle’s novel A Wrinkle in Time, both of which are known as a TESSERACT.