text: import random
  import os
  
  random.seed()
  
  # Variables
  
  playing_the_game = True
  
  ship_location = [[int(j) for j in range(25)] for _ in range(25)]
  playing_grid = [[int(j) for j in range(25)] for _ in range(25)]
  
  display_help_info = """
  The object of the game is to sink the ship.  There will be one ship 
  on the grid.  The player will choose horizontal and virtical coordinates 
  and the game will calculate whether those coordiantes were a hit or a 
  miss.  An \"X\" will mark a hit and \"*\" a miss.  The difficulty levels 
  will be set as follows;
  
   - Easy will be a grid of 10 x 10
   - Normal will be a grid of 15 x 15
   - Hard will be a grid of 20 x 20
  
  You will have 15, 20, and 25 attempts, respectively, to sink the ship.
  If you do not, the ship will escape and you lose.
  
  You may exit the game at any time by hitting \"Ctrl-C\".
  """
  
  # Build a 2 dimensional array of the size chosen
  def build_grid(gsize):
      for i in range(gsize):
          for j in range(gsize):
              playing_grid[i][j] = "  ."
  
  # Display the playing grid the size chosen
  def display_grid(gsize):
      os.system("clear")
      for x in range(gsize):
          if x < 10:
              print("  " + str(x+1), end="")
          else:
              print(" " + str(x+1), end="")
      print()
      
      for y in range(gsize):
          if y == 0:
              print(" --", end="")
          else:
              print("---", end="")
  
          if y == gsize - 1:
              print("-\\")
  
      for i in range(gsize):
          for j in range(gsize):
              print(playing_grid[i][j], end="")
          print(" |" + str(i+1))
  
  # Get the users coordinates
  def get_users_coordinates(gsize):
      while True:
          try:
              global acrossCoord
              acrossCoord = int(input("Enter across coordinate: "))
          except ValueError:
              print("Value must be a number")
          else:
              if acrossCoord > gsize or acrossCoord <= 0:
                  print("Value must be greater than zero and less than or equal to " + str(gsize))
              else:
                  break
  
      while True:
          try:
              global downCoord
              downCoord = int(input("Enter down coordinate: "))
          except ValueError:
              print("Value must be a number")
          else:
              if (downCoord > gsize or downCoord <= 0):
                  print("Value must be greater than zero and less than or equal to " + str(gsize))
              else:
                  break
  
  # Determin where and in what doirecton to place the ship
  def place_ship(gsize):
  
      direction = random.randint(1, 4)
  
      # The limiter keeps the ship from being placed outside the grid
      limiter = random.randint(0, 5)
      gridsize = random.randint(0, (gsize - 1))
      i = 0
  
      while i < 4:
          if direction == 1:  # North
             # playing_grid[limiter+i][gridsize] = "  @"    # <-- Used for debugging
             ship_location[limiter+i][gridsize] = "  @"
          elif direction == 2:    #South
             # playing_grid[(limiter + 3) - i][gridsize] = "  @"    # <-- Used for debugging
             ship_location[(limiter + 3) - i][gridsize] = "  @"
          elif direction == 3:    #East
             # playing_grid[gridsize][(limiter + 3) - i] = "  @"    # <-- Used for debugging
             ship_location[gridsize][(limiter + 3) - i] = "  @"
          elif direction == 4:    #West
             # playing_grid[gridsize][limiter + i] = "  @"    # <-- Used for debugging
             ship_location[gridsize][limiter + i] = "  @"
          else:
              # If we end up here, something broke
              print("Shit done did blowed up!")
          i += 1
  
  # CHeck to see if the coordinates the user entered hit the ship
  def calculate_hit():
      hit_counter = 0
  
      if playing_grid[downCoord - 1][acrossCoord - 1] == ship_location[downCoord - 1][acrossCoord - 1]:
          playing_grid[downCoord-1][acrossCoord-1] = "  X"
          hit_counter += 1
      else:
          playing_grid[downCoord-1][acrossCoord-1] = "  *"
  
      return hit_counter
  
  # Basically, the main game loop
  def play_game(gsize):
  
      is_it_sunk = 0
      play_counter = 0
  
      build_grid(gsize)
      place_ship(gsize)
      display_grid(gsize)
  
      while is_it_sunk < 4 and play_counter < gsize + 5:
          play_counter += 1
  
          print("You have " + str((gsize + 6) - play_counter) + " attempts left")
  
          get_users_coordinates(gsize)
  
          is_it_sunk += calculate_hit()
  
          display_grid(gsize)
          
      if is_it_sunk == 4:
          print("\n\"Hey! You sunk my ship!\"")
          print("\"It took you " + str(play_counter) + " shots to sink it.\"")
      else:
          print("\n\"Ha! You took too long. I got away!\"")
          print("Better luck next time.")
  
  # Initial game menu
  print("\nGreetings Professor Falken.")
  print("Welcome to \"Sink My Ship\"")
  
  while playing_the_game:
      print("\nPlease make a selection:")
      print("1 - Easy")
      print("2 - Normal")
      print("3 - Hard")
      print()
      print("H - Help")
      print("Q - Quit")
      print("-------------------------")
      choice = input("Enter your choice: ")
  
      if str(choice) == "1":
          play_game(10)
          break
      elif str(choice) == "2":
          play_game(15)
          break
      elif str(choice) == "3":
          play_game(20)
          break
      elif str(choice) == "H" or str(choice) == "h":
          print(display_help_info)
      elif str(choice) == "Q" or str(choice) == "q":
          playing_the_game = False
          print("\n\nThank you for playing.")
          print("Goodbye.\n")
          break
      else:
          print("\nError: You must enter one of the above options\n")
  
      pause = input("Press any key to continue...")
  
  