Air Raid Scenario:
Beat the Masquerade level on the "Agent" difficulty" setting with a time less than 3:15 to open Air Raid in multi-player.

Capture The Briefcase Scenario:
Beat the Turncoat level on the "Secret Agent" difficulty setting with a time less than 3:20 to open Capture The Briefcase in multi-player.

Castle Scenario:
Beat the Subway level on the "Agent" difficulty setting with a time less than 2:15 to open the Castle in multi-player.

Golden GunScenario:
Beat the game on the "00 Agent" difficulty setting to open the Golden Gun multi-player scenario. In this scenario, you must collect the three parts of the golden gun and defeat all of your opponents with it.

Sky Rail Scenario:
Beat the Cold Reception level on the "Secret Agent" difficulty setting with a time less than 3:15 to open the Sky Rail multi-player scenario.

Team King Of The Hill Scenario:
Beat the King's Ransom level on the "Agent" difficulty setting with a time less than 2:20 to open the Team King Of The Hill multi-player scenario.

Civilian Skins:
Beat the City Of Walkways 1 level on the "Agent" difficulty setting with a
time less than 3:35 to open the Civilian skins.

Classic Skins:
Beat the game on the "Secret Agent" difficulty setting to open Tuxedo Bond,
Baron Samedi, Oddjob, and Jaws.


Contemporary Skins:
Beat the game on the "Agent" difficulty setting to open Alec Trevlyan (006),
Wai Lin, Max Zorin, May Day, and Christmas Jones (dress).


Covert Skins:
Beat the City Of Walkways 1 level on the "Secret Agent" difficulty setting
with a time less than 3:45 to open the Covert skins.


Security Skins:
Beat the King's Ransom level on the "Secret Agent" difficulty setting with
a time less than 3:45 to open the Security skins.

Scientist Skins:
Beat the Masquerade level on the "00 Agent" difficulty setting with a time
less than 4:20 to open the Scientist skins.

Soldier Skins:
Beat the Midnight Departure level on the "Agent" difficulty setting with a
time less than 3:05 to open the Soldier skins.

Suit Skins:
Beat the Curiour level on the "Secret Agent" difficulty setting with a time
less than 2:00 to open the Suit skins.

Wildfire Mode:
Beat the City Of Walkways 2 level on the "Agent" difficulty setting with a
time less than 3:40 to open wildfire mode.

Hints

Quickly Now:
On the first level for a REALLY quick time, when you start, pause and switch to watch darts. Strafe towards the room where you get the safety deposit box, and dart the civilian security guard in here. Open the deposit box, and exit the level. Voila! Completed. Simple, and i have got 11 seconds using this method. I know it says that you have failed, but trust me on this one.

Get More 9mm Ammo:
If you set your watch to "stunner", you can temporarily stun your enemies. However, you can make your enemies drop their weapons that they are currently holding. All you need to do is to "shoot" with your stunner at an enemy two to three times QUICKLY. If you did it correctly, the weapon will drop out of their hand(s) and they will suffer from the temporary headache. If you wait until they get better, they will pull out a Wolfram P2K, so you can kill them or subdue them and take the 9mm ammo. This works only on enemies that originally had a weapon out. If the enemy doesn't have a weapon out, like the first enemy in the first level, you cannot get extra 9mm ammo.

GameShark Codes

Enable Code (Must Be On)
f10a92402400
f10a68041000 

Have All Levels Unlocked - Single Player Mode

81102ee60021 

Kings Ransom - Infinite Health
80395c8100c8 
I'm not sure if this code will work on all system

Thanks to Revolution readers charles hill, Mr. X, Charles Hill, Piranha II, Michael Krause and The Ice!