Boomshakalaka!

On level 3 (Hack to Slash) - after you have passed security level 5 you'll hack a computer, go upwards on a platform, and jump onto a second platform on your left. The basketball hoop is a pipe looped out of the wall. Keep going up on the rising platform and hack the computer at the top. It will release 2 basketballs. Push them off the left and make sure they fall into the loop. If it doesn't work out, reset back to a checkpoint - you can then re-hack the computer to get more balls.