Mission 1: Courier

After you destroy the cameras on the second story and walk through the hallway at the end of the 
cameras in the next hall the first room to the left will have two guards in it next to a computer. 
Kill the guards and the rest of the guards that come in the room,in the same room next to the 
computer there is a bookshelf, place a satchel charge on it or next to it and detonate it. The 
bookshelf will be gone and there will be a secret room where the bookshelf was go into it and there 
is ammo and heavy armor.
Submitted by texas1 at swconnect.net

To unlock the cheat in the Courier you must beat it within 2:00. Seems impossible, 
right? Well, not with this hint. What you do is get the securit safebox. Then pull 
the alarm. Then walk out of the bank. The level wil be completed and if you did this 
within the target time, you should have the cheat.
Submitted by PerfectAgent OO7 at AOL.com
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Mission 2: King'S Ransom
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Mission 3: Cold Reception

In order to get the skyrail level in multiplayer you have to beat the Cold Reception 
level on secret agent in 3:15or less.
by unknown
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Mission 4: Russian Roulette
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Mission 5: Night Watch

I found that the idea of using the tranquilizer was rather hard and teasing, so i worked my way around 
it, by punching all of the gaurds out. Just make sure you do it before they call out for the alarm or 
else you will fail. Once you knock the gaurds out you can pick up their weapons, but avoid using them, 
as it is using harmful tactics and you will fail. Good luck!
Submitted by grum27 at hotmail.com

At the start of the level, go into the room to your right. There is a telephone and a piano in there. 
If you walk up to the piano, stand in front of it and press the action key(o), then it will play a 
short piece of spine-tingling Bond music!
Submitted by samjenkins7@yahoo.co.uk
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Mission 6: Masquerade
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Mission 7: Flashpoint
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Mission 8: City Of Walkways
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Mission 9: Turncoat
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Mission 10: Fallen Angel
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Mission 11: Meltdown