You must unlock these cheats first by obtaining the number of Platinum medals shown next to each cheat. You will not be able to collect other Platinum medals when using a cheat while playing a level. 

Cheat - Platinum Medals Needed to Unlock - Button Combo 

Golden Gun: 1 Platinum - Pause game play, then press Circle, Triangle, X, Circle, Triangle
Improved Traction: 3 Platinums - Pause game play, then press Circle, Triangle, X, Circle, Triangle
Improved Battery: 5 Platinums - Pause game play, then press Circle, Triangle, X, Circle, Triangle
Double Ammo: 7 Platinums - Pause game play, then press Circle, Triangle, X, Circle, Triangle
Double Damage: 9 Platinums - Pause game play, then press Circle, Triangle, Triangle, Square, Circle
Full Ammo: 11 Platinums - Pause game play, then press Circle, Circle, Triangle, Square, Square
Cloak: 13 Platinums
Full Battery: 15 Platinums
All Weapons: 17 Platinums
Unlimited Battery: 19 Platinums
Slow Motion Driving: 25 Platinums
Unlimited Ammo: 23 Platinums
Platinum Gun: 27 Platinums



Hints
Multiplayer Characters and Arenas:
Earn the number of points shown to unlock the following characters and arenas for use in multiplayer mode. 

Points Required - Unlocked Item 

30 - Cistern (Arena)
50 - Baren Samedi
70 - Odd Job
90 - Egypt Commander
110 - Hazmat Guard
130 - Mya
160 - Test Lab (Arena)
180 - Egypt Guard
210 - South Commander
230 - Moscow Guard
260 - Le Rouge
290 - 003
320 - Katya Jumpsuit
350 - Serena
370 - Burn Chamber (Arena)
400 - Diavolo Moscow
430 - Serena
450 - Miss Nagai 

Gold Medal Unlock Bonuses:
Earn the number of Gold medals shown to unlock the following bonus items. 

Gold Medals Required - Unlocked Item 

1 - Production Stills 1
2 - Production Stills 2
3 - Production Stills 3
4 - Production Stills 4
5 - Production Stills 5
6 - Helicopter Weapon Upgrade
7 - Production Stills 6
8 - Serena
9 - Production Stills 7
10 - Tank Weapon Upgrade
11 - Underworld
12 - Cayenne Weapon Upgrade
13 - Production Stills 8
14 - Mya
15 - Vanquish Weapon Upgrade
16 - Production Stills 9
17 - Miss Nagai
18 - Production Stills 10
19 - Production Stills 11
20 - Katya
21 - Triumph Weapon Upgrade
22 - Production Stills 12
23 - Production Stills 13
24 - Nanotank Weapon Upgrade
25 - Production Stills 14
27 - Gallery 

Complete all missions - MI6 Combat Simulator
Complete all missions - MI6 Survival Test 

Bond Gadgets:
Beat the level shown to unlock the corresponding Bond gadget. 

Bond Gadget - Level 

EMP Grenade - The Pontchartrain Bridge
Frag Grenade - Ground Zero
Network Tap - Diavolo's Plan
Q-Cloak - Sand Storm
Q-Spider - Sand Storm
Q-Spider Dart - Diavolo's Plan
Q-Spider Explosive - A Show of Force
Q-Spider Nano - Diavolo's Plan
Rappel - Ground Zero
RC Car - Sand Storm
Sleeper Dart - Sand Storm
Strobe Grenade - Sand Storm
Thermovision - Ground Zero 

Gain Health: You will slowly regain health when you are crouched. 


Cheats
Single Player Cheats:
Earn the number of Platinum medals shown to unlock the following cheats for use in single player mode. 

Platinum Medals Required - Unlocked Cheat 

1 - Golden Gun
3 - Improved Traction
5 - Improved Battery
7 - Double Ammo
9 - Double Damage
11 - Full Ammo
13 - Cloak
15 - Full Battery
17 - All Weapons
19 - Unlimited Battery
23 - Unlimited Ammo
25 - Slow Motion Driving
27 - Platinum Gun