Easy rolling
To roll easily, instead of pressing [End] press the [Up] + [Down].
Easy way to face exactly north
Find any block that faces north. Climb up or jump to it. Go to the inventory screen and your compass should be transparent to confirm she is facing exactly north.
This may also be done by climbing a block that faces south. Press "Roll" once to point exactly north.
Save health packs
You can save health packs by going to a different level, then coming back for health because the levels are so numerous and close together.
Level 1 golden skulls
At the beginning, take a left up the small ledge.
In the room where you make your first jump, drop down into the water and go in the middle of the water.
In the room with the where you have to make two more jumps, fall down at the beginning. Run to the far end and turn to the right.
In the next room where you have to swim -- swim down to the bottom in the center of the room where the floor goes down slightly. Note: There is also a small and large medipack in a back room which is also under water.
In the area with the two boars, go around to the back and find the exit. Do not go in. Instead, turn right and go forward.
In the room where the skeleton has been impaled with the spikes, take a right when you enter.
In the crawl space, go to the left when you enter it.
When you get to the area just past the place where you have to "dive though the gap", go to the right and past the railing. Note: When Lara gets all eight golden skulls she will chose a different, harder path when Von Croy asks her where she wants to go.
Note: To take the easy route, the Path of the Virtuous, only seven skulls can be picked up when Von Croy opens the gate. Do not pick up the eighth skull until after he opens that gate and starts walking down. Then, go back, grab the skull, and take it easy.
Killing knights
To kill the knights found in The Lost Library, shoot the blue gem in their chest. Do not attack from the back, as it is just a waste of ammunitions. Six or seven direct hits with the shotgun or the crossbow will kill them.
No damage from Horus
Step into the blue light Horus was standing in before you put the armor on him. He can keep attacking, but it will not get through the light. Do not get behind it. If you do, his weapons will still hurt you. You must be inside the blue light. This works best when the "All weapons" code is enabled.
Underneath the Sphinx: Getting out
You can sneak past the bulls without waking them or worrying about locking them in their cages. First, make Lara face north and enable the "Unlimited items" code: Open the inventory screen and you should have all four keys you are supposed to collect in the level. Go to the far right and walk slowly past the cage and the pillar. Then, sidestep to the right until you are almost in the right corridor. Then, go behind the bulls and enter the stone tablets: right, left, middle. Sneak to the left and go to the gate you opened. From there, cross the two pits and place the keys in their correct locations. Go through the gate you opened and head across the monkey swing. Grab the scriptures and exit the level by the monkey swing. Remember to walk across the empty room after the scripture room, as there are spike traps located there.
Diving death
Go to a ledge with a long drop and do the special dive. Lara will land on her head and die.