Code works

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Code works. I am trying to figure out where to add an if or elif statement when the player moves in an invalid direction. Can someone please help me with the code?

 

def intro():
    print()


# Welcome the user to the game
print('Welcome to the Dragon Text Based Adventure Game!')
intro()

# A dictionary for the simplified dragon text game
# The dictionary links a room to other rooms.
rooms = [{'Great Hall': {'South': 'Bedroom'},
         'Bedroom': {'North': 'Great Hall', 'East': 'Cellar'},
          'Cellar': {'West': 'Bedroom'}}]

# Start loop
while True:
    start_game = input('Do you want to play? Yes/No: ').lower()
    print()
    if start_game == 'no':
        print('See you later')
        print('-----------------------------------')
    elif start_game == 'yes':
        prev_room = 'Great Hall'
        print('You are in the Great Hall!')
        print('Which way would you like to move? North, East, South, West or Exit? ')
        print('--------------------------------------------------------------------')
        while True:
            direction = input()
            if direction == "Exit" or direction == "exit":
                print('Good Bye!')
                exit()
            try:
                cur_room = rooms[0][prev_room][direction.capitalize()]
            except KeyError:
                print()
                continue
            try:
                cur_room = rooms[0][prev_room][direction.capitalize()]
                if cur_room == "Exit":
                    print("Game Over!")
                    break
                print('You are in ' + cur_room)
                print('Which way do you want to move? North, East, South, West or Exit? ')
                print('-----------------------------------------------------------------')
            except KeyError:
                pass
            prev_room = cur_room 
    else:
        print('See you later')