You can get into the back of the train!, what you have to do is, turn on invinsibility, 2x RCP-90s and lasers, blast your way to the end carrige, go inside and to the left, line up Ourumov's head with Xenia's then shoot through killing both at the same time then run to the back, once in here kill Trevelyan then go through the door, you will com into a funny shaped room and the doors seem to go outwards, there is one more wooden door at the end wich you cannot open, I think this leads to the chopper out on the deck.
If you go to the runway with all guns on, switch to the sniper rifle, then zoom out to te runway, you will notice that the guard and the toxic tank on the left will float in the air! you can shoot them in the air and they'll blow up!
Make Bond fly!, turn on tiny bond then go to the facility, go to the bottling room where you meet Trevelyan, now go to the to of the big flight of stairs, duck down then walk off, and you will float!, though you are kinda restricted to where you can go, it's still fun, you can fall down by pressing R.
Get back into the Vent in Facility, stand on the toilet, hold R, and c right and left on the control stick, you should jump back up!.
Taunt Natalya, go to the control, shoot out the comp so she goes back into the lift, then pull out your PP7 then shoot her and listen to her squeel!
Watch the Guards. If you watch the guards long enough the will sneeze, scratch the back of their leg, shoo a fly away and scratch their balls! I kid you not!
Fun in the Facility!. Switch on invins, infinate ammo, now switch to mines and start rampaging, open the doors to unsuspecting guards inside scratching their testicles, throw a mine say "Merry Christmas" or something like that. Then detonate in mid air U.E.O.'s (unidentified exploding objects) To do a u.e.o. go to damn with 2x grenade launchers or all guns and infinite ammo. Whip out the previously mentioned gun. Cross the bridge over that small canyon in the beginning. Now, turn around as if you were gonna go back, go over to the far left side of the area where the canyon curves off. Fire 8 or more grenades into that spot, if done correctly they should never explode. It takes a while to find a spot that works. Now fire one at the floor that is solid where the grenade will explode, now look up. If you missed it, you will notice that the screen shook to much for it to be one grenade. If not, you will see small explosions high in the corner you are facing, they look like they are in the sky. With a sniper rifle you can see them clearly if you have the time.
On the Surface(1), go to the entrance to the bunker, not ventalation tower, the door. Try opening it to set off the alarm. The guards in the blue suits will come. Some of them will have two faces.(one on the front one on the side.) More guards will have no face and a blind fold on. If it doesn't work the first time, keep on setting off alarm.
Invisible Proximity mines. Go to Archives on multiplayer and select prox mines, put on on any piece of paper on the wall then walk away, the mine dissapears! It is still there but only you know about it so an unsuspecting victim comes along and gets blown up!
Have you noticed in 00 agent that if you sort of taunt the guards they get angry and start moving faster!.
Turn on all guns then go to Bunker 2 and do the floating mines trick, not only do mines float but all missile items eg. Grenade/rocket launchers knives, and grenades, if you let a rocket go, watch the end of it, you'll see it has a texture, keep letting more rockets go and eventually a picture of Natalya will come on the end of the rocket!
Go to the surface 1, with all guns infinate ammo and invinsibility helps, once there, go to the bunker entrance, sound the alarm, kill the guys then you'll notice that thing start to screw up, like the rockets on the end of the rocket is green, black, blue etc, and the laser is clear not blue, the signs for the ammo is all messed up; this level is really screwed up with the programming, but here is the cool thing, switch to remote mines, go to the 2 huts surrounded by the compound fence, there will be 3 barrels to your right, go up to them and throw a mine in the center of the 3, the face of the mine will be a skull and crossbones!
On level 4 note that you need all guns and infinate ammo,
you can make a mine have the picture of Bond!!, first you have to make everything screw up, to fo
this, complete 1 objective(power down dish) then go to the bunker entrance, ring the alarm twice,
the guys with screwed up faces should come, then switch to remote mines in your inventory(there
should be no picture of them when you have selected them) throw a few, they should all be black,
now go to the sat dish and to where you powered down the dish, then throw a mine on the black
screen on the computer, it should be in the photo of bond!.