On the Subject of Red Arrows
I think you get the point now.
On the module are 4 directional buttons, and a display screen in the middle.
If the buttons are not Red, you're looking at a different module.
On the screen is a random number somewhere between 0 to 9. That is your starting position in the maze below. Once your first valid move have been made, the display will turn blank.
To solve the module, use the buttons to navigate the maze toward the last digit of the Serial Number.