Note: This cheat doesnt always work so keep on practising.

All Weapons

While playing, take out a flare, take one step forward (hold down walk key while pressing up arrow), then take one step backwards, turn around 3 full times and then jump backwards.

Exploding Lara

Draw any weapon, then walk one step forward, one step backwards, turn around in a circle three times then jump backwards.

Get Outside of Lara's Front Gate

In the practice level you can get outside of Lara's front gate. Simply go to the last obstacle(the rope slide) walk to the edge with the rope slide and side step right all the way you can. After this you must turn about an 1/8 of a turn towards the wall. Now jump in the air, without pushing any direction buttons, while in the air press the look button and forward, and let go before landing. Repeat this process a few more times and by about the third jump you should be on top of the tower and able to jump onto Lara's outside wall. Don't ask me why this happens must be a glich in the game. From here you can get outside of Lara's front gate or even get a view of her hedge maze, from above.

Goodbye Butler

Tired of the pesky butler following you around everywhere in Lara's home? Walk into the kitchen and open the freezer, go inside and wait for the butler to arrive. Once he comes in jump over him and close the door behind you. Bye, bye, butler.

Handstand

When Lara is hanging from a ledge, hold the WALK button and press UP to do a handstand.

Level Skip updates

While playing, pull out a flare then hold shift and move one step forward, one step backwards, turn around 3 times, and jump forward.

Open All Rooms in Lara's House

To open the two closed doors in Lara's house on the upper floor just simply beat the Assault Course in under 50 seconds. If you accomplish this act, the two doors should open to reveal the Butler's room and Lara's Recreational Room, which consists of a large screen T.V., pool table, sofa and the key to her gun closet.

Secret Room in Lara's House

When you explore the outside of the house go to the front door and open it. Walk straight in and look at the two halls on each side of the clock. You will be coming back to the righthand hall after you hit the switch I'm getting ready to tell you about.

Leave from the door you just opened and go to your left, head into the maze. Go left always in the maze unless your only option is to go right. When you get to the back of the maze you will see a brick wall, look down the hall and you will see two openings. Take the first opening to the right and fall into the hole. Then go to the end of the hall and jump out, push the button on the wall and you will see a cinema of the door opening back in the house. This door is timed, so you have to be fast.

Go back the way you came in, jump out of the hole and go left. Then keep following the maze turning right everytime unless you have to turn left. Exit the maze at the end and run back into the house and through the door. It leads to the basement below, where you'll you will see several chests and windows on each side.It looks like a huge statue is on the right.

Shortcut Thru Bartoli's Hideout

After you get the Stone Dragon, go to the previous room where you flipped the secret switch. Break out to the window where there will be a guard that drops the Uzi Clip. Go to the left side of the balcony and in the corner of the two railings. Face the orange building with shingles on the roof. Do a standing jump grab and twist right or left a little. You should grab the shingles. Get the Detonator Key and continue your level.

Survive Large Falls

If you fall off a reasonably high ledge hold the roll button and you will roll as you hit the ground. This does not work if the fall is so high it makes Lara scream.

Swan Dive

To make Lara do a Swan Dive, Hold Ctrl+Shift+Forward while jumping.

Swan Dive with a roll

Dive off a high ledge and about half way through the dive hold the roll button and Lara will roll before hitting the water.

Unlimited ammo

Finish the game and reload any level you will have unlimited ammo for every gun, unlimited medi-packs, unlmited flares and the enemies are harder.

Tips:

Venice Tip

To avoid the timed sequence at the end of the Venice section, just leave the boat in the room where the last swich is that opens the exit and swim out under the door and then swim to the exit. You'll get another boat at the start of Bartoli's Hideout.

Once you complete the game (without using cheats) you will find out that there is an extra level called "Driving Down Town" to get this level all you have to do is complete the game(without using cheats) and on the main screen press up, down, right, left 3 times. then go to load game and there should be a file named "Driving Down Town" This level is probably the best level where the enemy chases you and you have to try and escape on your car! (this is a very hard cheat so keep on practising)