Keys to Survival...On the PC
  Moving, Jogging, Turning, and Hopping
Hold down up and Lara will jog. Press left or right while jogging forward, and Lara will move at any angle you choose. Hold down left or right and Lara will stand in place and turn. Tapping up or down will make Lara hop.
  Walking
Hold down the Shift key while using the arrow keys. Pressing left or right will make Lara sidestep. When Lara is walking, she won't fall over any edges.
  Sprinting
While you're jogging, hold down ? and Lara will begin sprinting. Pressing Alt while sprinting will make Lara dive and roll forward--great for timed doors that close from top to bottom. If you let go of the arrows keys while running, Lara will slide to a stop.
  Drawing or Holstering a Weapon
Tap the Space Bar to either draw or holster the weapon that is currently selected.
  Using Weapons and Trigger Events
With a weapon drawn, hold down Ctrl to fire.
To activate triggers, such as levers, locked doors, etc., stand in front of the trigger and press Ctrl. If an item is needed to activate it, a menu will come up. Choose the item to be used. If you don't have the item needed in your inventory, Lara will say "No."
  Jumping
Pressing Alt will make Lara jump straight up. Press one of the arrow keys to jump in that direction. You can make some minor adjustments by pressing another key while she is already jumping, ie. jumping forward and holding down right while in the air.
  Twisting Jump
When you jump forward or backward, press or respectively, while Lara is in the air, but before she has reached the height of the jump. Lara will turn around in the air and land facing the opposite direction.
  Climbing and Pulling Up onto an Object
Lara can climb poles and walls that have ladders, vines, or lattice. Walk up to the wall and hold down Ctrl (holster any weapons first). Lara will grab onto the wall and from there you can move up, down, left, or right using the arrow keys. Don't let go of control while climbing. If you do, press Ctrl again, and Lara will grab onto to pole or wall again.
To pull yourself onto an object, stand in front of it and press Ctrl and up. Keep holding them down and Lara will pull herself up. An alternate way to get to the top of a ledge is to do a handstand. To do this, press Ctrl and up. Let go of up so that Lara doesn't pull herself to the top. Then, Press Shift and up and Lara will do a handstand.
To get to high places, press jump first.
  Long Jumps
To make long jumps, walk up to the edge, and hop back (press down once). Then jog forward and press Alt and up before you get to the edge.
For especially long jumps, press Ctrl while in the air to grab onto the edge at the other side.
  Swan Dive/Somersault
Hold down Ctrl. Then press Alt. While in the air, press up and Lara will perform a swan dive into water. On land, she'll jump up, dive and roll forward.
  Handstand
While hanging from a ledge, press Shift and up
  Climbing and Pulling Up onto an Object
Lara can climb poles and walls that have ladders, vines, or lattice. Walk up to the wall and hold down Ctrl (holster any weapons first). Lara will grab onto the wall and from there you can move up, down, left, or right using the arrow keys. Don't let go of control while climbing. If you do, press Ctrl again, and Lara will grab onto to pole or wall again.
To pull yourself onto an object, stand in front of it and press Ctrl and up. To get to high places, press jump first.
  Swimming
While underwater, use Alt to swim forward. Pressing or with Alt will allow you to control where Lara swims.
Pressing while underwater will make Lara dive deeper, while pressing will make Lara swim to the surface.
When on the surface, the arrow keys work as they would if Lara were on land.
To climb out of the water, swim to a low edge and press Ctrl. While underwater, you can roll, use a harpoon gun, pull levers, and pick up items.
  Drawing/Throwing Flares
Press < to draw a flare. When you have one lit, hit < again and Lara will throw it forward.
  Monkey Bars
Stand directly under the monkey bars. Jump straight up and press Ctrl to grab them. Use the arrow keys to move across. Then let go of Ctrl to drop down.
  Swinging from Ropes
First line yourself up with the rope. Then jump forward and press Ctrl to grab onto it. Use to climb up the rope and to slide down the rope.
You'll get your best swing when you're at the bottom of the rope, but be careful not to get swinging too much, as Lara can get pretty high and take some damage when you make your jump and land.
To get swinging, hold down the Sprint Key, ?. When you've reached a height you like, press Alt to jump. Just stay on the safe side, never let go of Ctrl.