Level Select:
Do the following moves in order: Draw Lara's pistols, Take one step back. Take one step forward. Duck and Stand. Spin around three times, then jump forward.

Get All Weapons:
Do the following moves in order to get all weapons. Draw Lara's pistols. Take one step back, Take one step forward. Duck and stand. Spin around three times, then jump backwards.

How to Find Lara's Basement and Race Course Key:
Go to the Library. After Lara walks in the doorway, there are two bookcases on her 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 passageways 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. After 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.

Hint: Lara's museum:
Activate the switch on the back of the diving board in Laura's pool room. Go to the door it opens in her lobby. Pull the lever, and quickly roll. Sprint straight across her lobby and roll into her museum, barely making it in time. The Dagger of Xian among other artifacts are in her museum.

Blow Up Lara:
Do the exact same moves for all weapons (see above) except instead of having your pistols drawn, have a flare drawn.