The underground tunnels hide a secret and could be an alternative way to travel. But having access to them, at first, won't be as easy as you see in this clip.
Welcome to hell, mister Guatamez.
Layer of diagonals: indicates which parts of the road correspond to a slope or staircase. RGB values are used to indicate the direction of the diagonal (R), the degree of the slope (G) as well as the appropriate animation of the character (horizontal or vertical) (B). With these three values the optimal way that the Wanderer character should go up and down stairs is calculated both when moving by pathfinding (mouse) and when moving with the keyboard.
Object layer: similar to the navigation image, it indicates in which parts of the stage it is possible to drop an object and in which not.
Pathfinding layer: it is a grid of points over the walkable area that is used with the pathfinding algorithm A * (A star). This grid is automatically generated from the navigation layer.