• Description emphasizes it's only...

Question related to mission 8 Puzzle

 

Description emphasizes it's only about 3x3 matrix, but when I click "Solve It" I see:

print(checkio([[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 12, 15], [13, 14, 11, 0]]))