Level			Cheat			Difficulty		Time

Level 1 - Dam		Paintball Mode		Secret Agent		2:40
Level 2 - Facility	Invincibility		00 Agent		2:05
Level 3- Runway		DK Mode			Agent			5:00
Level 4 - Surface	2x Grenade Launcher	Secret Agent		3:30
Level 5 - Bunker	2x Rocket Launcher	00 Agent		4:00
Level 6 - Silo		Turbo Mode		Agent			3:00
Level 7 - Frigate	No Radar (Multi)	Secret Agent		4:30
Level 8 - Surface2	Tiny Bond		00 Agent		4:15
Level 9 - Bunker2	2x Throwing Knives	Agent			1:30
Level 10 - Statue	Fast Animation		Secret Agent		3:15
Level 11 - Archives	Invisibility		00 Agent		1:20
Level 12 - Streets	Enemy Rockets		Agent			1:45
Level 13 - Depot	Slow Animation		Secret Agent		1:40
Level 14 - Train	Silver PP7		00 Agent		5:25
Level 15 - Jungle	2x Hunting Knives	Agent			3:45
Level 16 - Control	Infinite Ammo		Secret Agent		10:00
Level 17 - Caverns	2x RC-P90s		00 Agent	   	9:30
Level 18 - Cradle	Gold PP7		Agent		 	2:15
Level 19 - Aztec	2x Lasers		Secret Agent		9:00
Level 20 - Egyptian	All Guns		00 Agent		6:00

Other weapon cheats can be enabled merely by completing certain levels: 

Weapon		Level
Magnum		Antenna Cradle, Janus Base
Laser		Aztec Complex
Golden Gun	Egyptian Temple