In the mission where you infiltrate the White Box company, after killing
the guard by the front car lot, infiltrate the building. When you first
see the room, you can climb up the pipe or throw an object (frag
grenade, proximity mine, remote mine, sticky cam, or EMP grenade) into
the room. Even on the Realistic difficulty, the most the AI can do is
shout and raise their guns, provided you have upgraded each gadget to
the maximum. This room provides many ways to get and complete any
challenge, except for most of the Splinter Cell challenge group. *Note:*
This can be repeated as many times as desired by reverting back to last
checkpoint.