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hi , I found this code on the internet , I changed and added some lines to it to make it the way I like . I am very weak in using functions and even worse in using classes , I appreciate it if some one can change this code into functions or classes .

```
'''
this is a slide puzzle game .
the square marked 'xx' is the empty space
the board is randomly filled so whenever you start the game you
will get a fresh board .
'''
import string
import random
piece=()
move = 0
empty_space=()
list1 = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
#to get shuffled list
random.shuffle(list1)
print('\n'*2)
#to make list of lists
matrix=[]
while list1 !=[]:
matrix.append(list1[:4])
list1 = list1[4:]
# to find the empty space
# we can also delete this section and just add a one line
# empty_space = (x,y) before the print('|xx .. ) statement
for x in range (len(matrix)):
for y in range(len(matrix[x])):
if matrix[x][y] == 0:
empty_space = (x,y)
print()
#to print the list in two digit matrix
while True:
print('\n+----+----+----+---|')
for x in range (len(matrix)):
for y in range(len(matrix[x])):
if matrix[x][y] == 0:
print('|XX' , end=' ')
else:
print('|' + '{:02d}' .format(matrix[x][y]), end=' ')
print('\n+----+----+----+---|')
#ask for the next move
num = input('\nplease type the number of the piece to move : ( q ) to quit ')
if num in ['q','Q']:
break
num = int(num)
for i in range(len(matrix)):
for j in range(len(matrix[i])):
if num == matrix[i][j]:
piece = (i,j)
if num > 15:
print('illegal move ')
else:
if(empty_space==(piece[0]-1,piece[1]))\
or(empty_space==(piece[0]+1,piece[1]))\
or(empty_space==(piece[0],piece[1]-1))\
or(empty_space==(piece[0],piece[1]+1)):
matrix[empty_space[0]][empty_space[1]]=num
matrix[piece[0]][piece[1]]=0
empty_space=(piece[0],piece[1])
move = move +1
print()
print('you have made ',move , 'moves so far ')
print(2*'\n')
else:
print('illegal move , try again ')
print('game over ')
```