Unlock ALL Weapons:
At the Cheat menu enter Down, Left, Up-C, Right, L + Down, L + Left, L + Up, Left-C, Left, Hold Down-C until you hear a confirmation sound. Leave the menu and then go back in and your cheat will appear.

Unlock Infinite Ammo:
At the Cheat menu enter L + Left-C, L + R + Right, Right-C, Left-C, R + Left, L + Down-C, L + R + Left, L + R + Down-C, L + Up, Hold Right-C until you hear a confirmation sound. Leave the menu and then go back in and your cheat will appear.


Time Unlockables
The built-in Cheat Options menu are automatically activated when you complete tasks in certain modes and time limits.

Unlock Level 1:
Dam Paintball Mode - Secret Agent 2:40

Unlock Level 2:
Facility Invincibility - 00 Agent 2:05

Unlock Level 3:
Runway DK (Big Head) - Agent 5:00

Unlock Level 4:
Surface 1 2x Grenade Launcher - Secret Agent 3:30

Unlock Level 5:
Bunker 1 Rocket Launcher - 00 Agent 4:00

Unlock Level 6:
Silo Turbo Mode - Agent 3:00

Unlock Level 7:
Frigate No Radar (Multi) - Secret Agent 4:30

Unlock Level 8:
Surface 2 Tiny Bond - 00 Agent 4:15

Unlock Level 9:
Bunker 2 2x Throwing Knives - Agent 1:30

Unlock Level 10:
Statue Fast Animation - Secret Agent 3:15

Unlock Level 11:
Archives Invisibility - 00 Agent 1:20

Unlock Level 12:
Streets Enemy Rockets - Agent 1:45

Unlock Level 13:
Depot Slow Animation Secret - Agent 1:30

Unlock Level 14:
Train Silver PP7 - 00 Agent 5:25

Unlock Level 15:
Jungle 2x Hunting Knives - Agent 3:45

Unlock Level 16:
Control Infinite Ammo Secret - Agent 10:00

Unlock Level 17:
Caverns 2x RC-P90s - 00 Agent 9:30

Unlock Level 18:
Cradle Gold PP7 - Agent 2:15

Unlock Level 19:
Aztec 2x Lasers - Secret Agent 9:00

Unlock Level 20:
Egyptian All Guns - 00 Agent 6:00