Maze Game Python

import turtle

wn = turtle.Screen()
wn.bgcolor("black")
wn.title("Maze Game")
wn.setup(700,700)


#create pen
class Pen(turtle.Turtle):

    def __init__(self):

        turtle.Turtle.__init__(self)



        self.shape("square")
        self.color("white")
        self.penup()
        self.speed(0)


#create level list
levels = [""]
level_1 = [
"XXXXXXXXXXXXXXXXXXXXXXXXX",
"X  XXXXXXX          XXXXX",
"X           XXXXXX  XXXXX",
"X  XXXXXXX          XXXXX",
"X  XXXXXXXXXXXXXXXXXXXXXX",
"X  XXXXXXXXXXXXXXXXXXXXXX",
"X                       X",
"XXXXXXX  XXXXXXXXXXXXXXXX",
"XXXXXX   XXXXXXXXXXXXXXXX",
"XXXXXX                  X",
"XXXXXX   XXXXXXXXXXXXXXXX",
"XXXXXX   XXXXXXXXXXXXXXXX",
"X                       X",
"XXXXX    XXXXXXXXXX   XXX",
"X        XXXXXXXXXXXXXXXX",
"XXXXXX   XXXXXXXXXXXXXXXX",
"X                       X",
"XXXXXX   XXXX   XXXXXXXXX",
"XXXXXX   XXXX   XXXXXXXXX",
"XXXXX    XXXX           X",
"X               X       X",
"XXXXXXX   XXXXXXXXXXXXXXX",
"XXXXXX    XXXXXXXXXXXXXXX",
"XXXXXXXXXXXXXXXXXXXXXXXXX",
"XXXXXXXXXXXXXXXXXXXXXXXXX"
]


levels.append(level_1)

def setup_maze(level):

    for y in range(len(level)):
        for x in range(len(level[y])):

            character = level[y][x]
            screen_x = -288 + (x * 24)
            screen_y = 288 - (y * 24)

            if character == "X":


                pen.goto(screen_x, screen_y)
                pen.stamp()



#class instances
pen = Pen()

setup_maze(levels[1])

#main game loop
while True:
    pass