I added some upgrades to the game. Please help making the code more efficient.

import random
import sys
#Create a health function maximum 2 health DONE
#Make the monster get closer with each try DONE
#create an addtional monster DONE
#Make the map bigger DONE
#two encounters with the monster end the game DONE
#Add a health collection method 1 health each time NOT DONE
#Warn player if monster is near by NOT DONE
#introduce 3 difference weapons for the player NOT DONE
#delete and remove the previously used boxes NOT DONE
#create a function to display all relevant information in a presentable manner NOT DONE
#litter the place with mines DONE
#new objective: litter the mines around the door, creating only one escape door NOT DONE
CELLS = [(0, 0), (0, 1), (0, 2), (0, 3), (0, 4), (0, 5),
         (1, 0), (1, 1), (1, 2), (1, 3), (1, 4), (1, 5),
         (2, 0), (2, 1), (2, 2), (2, 3), (2, 4), (2, 5),
         (3, 0), (3, 1), (3, 2), (3, 3), (3, 4), (3, 5),
         (4, 0), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5),
         (5, 0), (5, 1), (5, 2), (5, 3), (5, 4), (5, 5)] 


health = 2
def exit():
    sys.exit()

def get_locations():

  monster = random.choice(CELLS)

  door = random.choice(CELLS)

  start = random.choice(CELLS)
  monster2 = random.choice(CELLS)
  mine_locations = random.sample(CELLS, 6)




  if monster == start or monster == door or monster2 == start or monster2 == door or start == door:
     return get_locations()
  if monster in mine_locations or start in mine_locations or door in mine_locations or monster2 in mine_locations:
    return get_locations()
  print("POSSIBLE MINE LOCATIONS: {}".format(mine_locations))
  return monster, door, start, monster2, mine_locations

def move_monster_closer(player):

  #collect the player's location
  px, py = player
  #create a list of possible locations around the player
  x1, y1 = px - 1, py - 1
  x2, y2 = px - 1, py
  x3, y3 = px - 1, py + 1
  x4, y4 = px, py - 1
  x5, y5 = px, py + 1
  x6, y6 = px + 1, py - 1
  x7, y7 = px + 1, py
  x8, y8 = px + 1, py + 1

  xy_list = [(x1, y1), (x2, y2), (x3, y3), (x4, y4), (x5, y5), (x6, y6), (x7, y7), (x8, y8)]
  bad_locations = []
  #print("This is the possible location list: {}".format(xy_list))
  for xy_item in xy_list:
    if xy_item[0] > 5 or xy_item[1] > 5 or xy_item[0] < 0 or xy_item[1] < 0:
      bad_locations.append(xy_item)
  for xy_item in bad_locations:
      while True:
        try:
          xy_list.remove(xy_item)
        except:
          break

  #print("These are the bad locations: {}".format(bad_locations))
  #print("This is the list of location from which the monster chose: {}".format(xy_list))
  monster = random.choice(xy_list)
  xy_list.remove(monster)
  #print("These are the possible locations for monster 2: {}".format(xy_list))
  monster2 = random.choice(xy_list)
  return monster, monster2


  #limit the maximum and minimum values of x, y to keep the monster in side the map

  print("Player correctly in cell: {}".format(player_cell))


def move_player(player, move):
  #Get the player's current location

  x, y = player

  if move == 'LEFT':
    y-=1
  elif move == 'RIGHT':
    y+=1
  elif move == 'UP':
    x-=1
  elif move == 'DOWN':
    x+=1
  return x, y


def get_moves(player):
  moves = ['LEFT', 'RIGHT', 'UP', 'DOWN']

  #player = (x, y)
  if player[1] == 0:
     moves.remove('LEFT')
  if player[1] == 5:
     moves.remove('RIGHT')
  if player[0] == 0:
     moves.remove('UP')
  if player[0] == 5:
     moves.remove('DOWN')

  return moves

def draw_map(player, monster, monster2, door, mine_locations):

  print(' _ _ _ _ _ _')
  tile = '|{}'

  for idx, cell in enumerate(CELLS):
    #use slicing here to shorten this code down
      if idx in [0, 1, 2, 3, 4, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28,
                 30, 31, 32, 33, 34]:
        if cell == player:
          print(tile.format('X'), end='')
        elif cell == monster:
          print(tile.format('@'), end='')
        elif cell in mine_locations:
              print(tile.format('#'), end='')
        #elif cell == monster2:
          #print(tile.format('2'), end='')
        elif cell == door:
          print(tile.format('D'), end='')
        else:
          print(tile.format('_'), end='')
      else:
        if cell == player:
          print(tile.format('X|'))
        elif cell == monster:
          print(tile.format('@|'))
        elif cell in mine_locations:
          print(tile.format('#|'))
        elif cell == door:
          print(tile.format('D|'))
        #elif cell == monster2:
          #print(tile.format('2|'))
        else:
          print(tile.format('_|'))
monster, door, player, monster2, mine_locations = get_locations()
print("Welcome to the dungeon!")
while True:


  moves = get_moves(player)

  print("You are currently in room".format(player))
  #print("POSSIBLE MINE LOCATIONS: {}".format(mine_locations)) 
  #draw_map(player, monster)
  draw_map(player, monster, monster2, door, mine_locations)
  #draw_map(player, monster, monster2, door)
  #move_monster_closer(monster, player)
  print("You're currently in room {}".format(player))  # fill in with player position
  print("Monster is currently in room {}".format(monster))
  print("Hidden monster location: {}".format("Unknown"))
  print("You can move {}".format(moves))  # fill in with available moves
  print("Enter QUIT to quit")
  print("Health status: {}".format(health))

  move = input("> ")
  move = move.upper()

  if move == 'QUIT':
    break
  if move in moves:
    player = move_player(player, move)
  else:
    print("**Walls are hard. Stop walking into them! **")
    continue
  if health == 0 and player == monster:
    print("Ouch! You were eaten by the monster!")
    exit()  
  if player == monster:
    print("You were almost eaten! though the extent of your injuries give you a chance of survival;\nDo not expect to be so lucky next time!".upper())
    health-=1
  elif player == door:
    print("You escaped!")
    exit()
  elif player == monster2:
    print("Ouch! You were eaten by the second hidden monster!")
    exit()
  elif player in mine_locations:
    print("*BOOM!* You hit a mine! x_x ")
    exit()
  #print("Monster 2 is currently in room {}".format(monster2))
  monster, monster2 = move_monster_closer(player)
get_locations()