In multi-player choose to go to the Sky Rail level. Go to one of the buildings and climb to the very top( on the top of the sky rail).
When the sky rail starts to leave run out on the wire and stop on the grey piece.
Now you can(1) fall down ontop of the roof of the sky rail( the red part of the cart )and stay there and sniper people ( you won't fall when you reach the next building ).
Or (2) you can just stay on the grey piece and ( if you are using explosives ) you can use them without fear of hitting anything ( like the pole inside of the cart ).
If you need more help, we've got more 007: The World is not Enough cheats and also check out all of the answers for this game
Comments for this hint