Here is my extended version of the dungeon game.

import os
import random



def clear_screen():
    os.system('cls' if os.name == 'nt' else 'clear')

def get_locations(CELLS):
    return random.sample(CELLS, 4) #does not include repeats

def move_player(player, move):
    x, y = player
    if move == "LEFT":
        x -= 1
    if move == "RIGHT":
        x += 1
    if move == "UP":
        y -= 1
    if move == "DOWN":
        y += 1
    return x, y

def get_moves(player, play_field):
    moves = ["LEFT", "RIGHT", "UP", "DOWN"]
    x, y = player
    if x == 0:
        moves.remove("LEFT")
    if x == play_field - 1:
        moves.remove("RIGHT")
    if y == 0:
        moves.remove("UP")
    if y == play_field - 1:
        moves.remove("DOWN")
    return moves

def draw_map(player, path, CELLS, play_field):
    print(" _"*play_field)
    tile = "|{}"

    for cell in CELLS:
        x, y = cell
        if x < play_field - 1:
            line_end = ""
            if cell == player:
               output = tile.format("X")
            elif cell in path:
                output = tile.format("*")
            else:
                output = tile.format("_")
        else:
             line_end = "\n"
             if cell == player:
                 output = tile.format("X|")
             elif cell in path:
                 output = tile.format("*|")
             else:
                output = tile.format("_|")
        print(output, end=line_end)

def draw_cheat_map(player, path, CELLS, play_field, door, monster1, monster2):
    print(" _"*play_field)
    tile = "|{}"

    for cell in CELLS:
        x, y = cell
        if x < play_field - 1:
            line_end = ""
            if cell == player:
               output = tile.format("X")
            elif cell == monster1:
                output = tile.format("M")
            elif cell == monster2:
                output = tile.format("M")
            elif cell == door:
                output = tile.format("D")
            elif cell in path:
                output = tile.format("*")
            else:
                output = tile.format("_")
        else:
             line_end = "\n"
             if cell == player:
                 output = tile.format("X|")
             elif cell == monster1:
                output = tile.format("M|")
             elif cell == monster2:
                output = tile.format("M|")
             elif cell == door:
                output = tile.format("D|")
             elif cell in path:
                 output = tile.format("*|")
             else:
                output = tile.format("_|")
        print(output, end=line_end)


def game_loop():
    while True:
        try:
            CELLS = []
            play_field = int(input("Enter a number for size of playing field 2 or greater: "))
            if play_field >= 2:
                for y in range(play_field):
                    for x in range(play_field):
                        CELLS.append((x, y))
                monster1, monster2, door, player = get_locations(CELLS)
                playing = True
                path = []
                score = 0
                break
            else:
                print("The playing field must be 2 or greater!")
        except ValueError:
            print("Please enter numeric values only!")

    while playing:
        clear_screen()

        draw_map(player, path, CELLS, play_field)
        valid_moves = get_moves(player, play_field)
        print("You're currently in  room {}".format(player))
        print("Current score: {} PTS".format(score))
        print("You can move {}".format(", ".join(valid_moves)))
        print("Enter QUIT to quit or CHEAT to cheat")
        path.append(player)
        score += 5
        move = input("> ").upper()
        if move == "QUIT":
            print("\n ** See you next time ** \n")
            break
        elif move == "CHEAT":
            clear_screen()
            draw_cheat_map(player, path, CELLS, play_field, door, monster1, monster2)
            print("Icon key: X = Player; M = Monsters; D = Door.")
            input("Press Enter to stop cheating. ")
            continue
        if move in valid_moves:
            player = move_player(player, move)
            if player == monster1 or player == monster2:
                print("\n ** oh no! The monster got you! Better luck next time! **\n")
                playing = False
            if player == door:
                print("\n ** You escaped! Congratulations! **\n")
                playing = False
        else:
            input("\n ** Walls are hard! Don't run into them! **\n")
            continue
    else:
        if input("Play again? [Y/n] ").lower() != "n":
            game_loop()


clear_screen()
print("Welcome to the dungeon!")
input("Press Enter to start game! ")
clear_screen()
game_loop()