import random

def guess_number():
    def get_difficulty():
        while True:
            difficulty = input("Choose a difficulty level (easy, medium, hard): ").lower()
            if difficulty in ['easy', 'medium', 'hard']:
                return difficulty
            else:
                print("Invalid difficulty level. Please choose from easy, medium, or hard.")

    def play_again():
        return input("Do you want to play again? (yes/no): ").lower() == 'yes'

    while True:
        difficulty = get_difficulty()

        if difficulty == 'easy':
            max_number = 50
            max_attempts = 8
        elif difficulty == 'medium':
            max_number = 100
            max_attempts = 6
        else:
            max_number = 200
            max_attempts = 4

        secret_number = random.randint(1, max_number)

        print(f"Welcome to the {difficulty.capitalize()} Number Guessing Game!")
        print(f"I have chosen a number between 1 and {max_number}. Try to guess it!")

        for attempt in range(1, max_attempts + 1):
            guess = int(input("Enter your guess: "))

            if guess == secret_number:
                print(f"Congratulations! You guessed the number in {attempt} attempts.")
                break
            elif guess < secret_number:
                print("Too low! Try again.")
            else:
                print("Too high! Try again.")

        else:
            print(f"Sorry, you've run out of attempts. The correct number was {secret_number}.")

        if not play_again():
            break

if __name__ == "__main__":
    guess_number()