STEP 10: Let's calculate the x-coordinate for our first square in the top lefthand corner.

• Inside your for loop in create_maze(), change the variable to the left of the = sign from my_var to x.
• Change number 2 to -250 and the number 3 to square_length/2.
• We place squares using their center coordinates, so we're adding half the square's length to -250. Also, we're placing this code inside our first for loop, so x refreshes for every row.

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