def update

(Around line #204)

Then you will see that code neat below that line:

case Input.dir4
      when 2
        move_down
      when 4
        move_left
      when 6
        move_right
      when 8
        move_up
    end

Replace that block of code by the following:

case Input.dir8 
      when 2 
        move_down 
      when 4 
        move_left 
      when 6 
        move_right 
      when 8 
        move_up 
      when 7 
        move_upper_left 
      when 9 
        move_upper_right 
      when 3 
        move_lower_right 
      when 1 
        move_lower_left 
      end

And you are done.

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