All of these are just common sense. I found these out the first time i played downfall. If you go all the way to the bottom, you can jump on this metal thing and see half the map. And then at the top, you can jump on a truck and jump on a wall and prone. Then on the left side, where you go to the back of the building and go up the ramp...you can jump on the boxes and go to the corner all the way to the right(its useful but its easy for them to spot you).Now those are good!!