Here are the cheats for the Tomb Raider Chronicles game .
All Items - First open the Inventory screen . Go to Timex Menu and press L1 + L2 + R1 + R2 + Down then press the triangle button . Raturn to the Inventory screen and you will have collected all keys and items . Well at least that is what they say . It may work and it may not work .
Unlimited Ammo/Health - First go to the Inventory screen . Then highlight the small medkit and press and hold L1 + L2 + R1 + R2 and press up .
Special Features - Go to the inventory screen . Then highlight the Timex and hold L1 + L2 + R1 + R2 + Down + the Circle button and press the triangle button . Then quit and you will find special features on the Main Menu .
View Cutscenes - From the Main Menu , hold R2 and press Select .
I will have more cheats for you as they become available .