Runners began to change

Endl began to realize that every corridor he passed, things started to change, sometimes some bricks were out of place, other times some bricks were in a different color, sometimes there was something on the floor, there were many simple things that called for Endl's attention, after he realized this fact, kept paying more attention wherever he went.

After a long run through the corridors, he found a pattern, a pattern that may not make much sense, but that he came to realize.

Whenever the colors of the bricks changed, the corridor only had passage to the right, when the bricks were out of place, the corridor only had passage to the left, and when there was something on the floor, the corridor was always dead end.

This is a pattern that doesn't make any sense, so Endl got more and more confused by all of this, but he knows one thing, things were working out the same way. He tested it a few times to see if it was that way, and it was like that.