This is a 2D game based on artificial intelligence. The ghosts wander when the player is not within proximity. If the player gets close enough to the ghost, they will flee away. The guard has visual awareness and its restricted, so he cannot see behind him. This line of sight breaks when the player has successfully hidden behind a wall or obstacle.

If the player is in line of sight, the guard will follow you and will not stop unless this line is broken, then he will return to his original path.