All Weapons
Draw pistols, step backwards, step forward, duck, stop ducking, turn around three times to the right, and jump backwards. This will give you all the weapons in the game.
Submitted by Raider_2K. 

Level Skip
Draw pistols, step backwards, step forward, duck, stop ducking, turn around three times to the right, and jump forwards. This will make you skip to the next level.
Submitted by Raider_2K. 

Secret Room in Lara's Mansion
Enter the Lara's mansion and go to her pool. Behind the diving board there is a switch. Press it to open a door in the main room with a switch behind it. Pull the switch and quickly turn around and sprint for the room across the hall. Inside the room you'll find some of the artifacts from the original Tomb Raider and Tomb Raider 2.
Submitted by Raider_2K. 

Race Key and Basement
Go to the Library. When Lara walks in the doorway, there are two bookcases to the right. Approach the one on the left and press Action. Lara will pull a book and the fire will extinguish, allowing her to climb up the side wall inside the fireplace. After reaching the top, follow the passage-ways until reaching a room with two levels, with a switch on the top level. Pull the blocks in a way that a hallway leading into the attic is revealed. When Lara pulls the switch, the basement door will temporarily open. Quickly run through the attic, and down to the main hall to reach the basement. Once in the basement, walk through to the second room and look in the tank on the right side. Inside is the key to the race course. To collect it, pull the block in the other room to the center. Climbing up to that hall leads to the tank.
Submitted by Raider_2K. 

Go to: Tomb Raider 3: Adventures of Lara Croft Info Page | nGaming Home Page.