In a maze there is a human and several monsters. Human wants to escape (reach “exit” point). Monsters, as you may be already thought, want to eat him for breakfast. Everything might be “as usual”, but human is in panic and you cannot control him at all! He is running along straight line until reach wall and then turn his face to a random side and run again. One way exists to help human – you may rotate walls (what a maze without such tricks?). Only this may help him leave the maze avoiding monsters.