Tomb Raider: Underworld

GLITCH WARNING:

See for how to avoid a really nasty glitch: Tomb Raider Underworld Walkthrough and Game Guide - Southern Mexico: The Unnamed Days

You start the level off on your bike, so just continue along the jungle path and then go up the hill that lurches around to the left. Now you have reached a stone building, you will want to climb up this by going up the pillar at the start and then climbing as high as you can go up the building face. Then go left and drop down to the small hole in the buildings face, grapple onto the block in here and drop back out of the hole while holding onto it. Swing to the right and jump in the bigger hole in the buildings face and grab the head of the animal thing on the other side of the room. Wall jump up the side to reach the exit and jump to the wooden plank on the side of the pillar. When you get back to the ground two panthers will attack you, kill them and get back on the bike and continue along the winding maze path and go through the underground tunnel and go along the dirt path for a little longer. You will now reach the next stone building, so go towards that area and don't continue along the jungle path. There will be a dead mercenary on the floor and the entrance to the building has a half open door, crouch under this and go into the building. A cut scene will play and you want to put the head of the thing you found earlier in the middle of the puzzle.

1st Ring Puzzle

First, put the things head in the middle. Now spin counter clockwise until the black part on middle ring is next to the black part on the outer ring. Now grab the outer ring skull thing and move it so the black part of the ring is facing about 5 o'clock. This releases the rings so you can turn the very centre ring without moving the others. Once you have done that go back to the centre spinning thing and turn the very centre ring so it is line with 6 o'clock and facing the other black parts. Go back to the outside spinner thing and turn the outside ring back to 6 o'clock, all of the black parts should be all in line with each other now. A bit in the middle with open and you have finished the first puzzle.

Go back outside and kill the panthers that have appeared, get back onto your bike and continue along the jungle path. Jump over the first gap, now go around the left of the other hole in the ground as there is no ramp. You will then reach a part where you can either continue up the path or go to through the archway on the left, go left. At the end of this path you have to dismount your bike as it cannot go up here. You are now in a big area and mercenaries are fighting panthers, leave them kill each other. You will notice a gold coloured wooden pole on the floor, pick it up and bring it up the stairs and plug it into the lower hole on the pillars on the left hand side, climb up it and navigate up the pillars to reach the inside of the temple. Once inside, climb to the higher level and you with reach the area with the square on the floor, climb to the higher level and grapple on to the grapple in the distance, walk to the level while having the grapple still connected to pull the rock off the edge to make a hole in the floor. Navigate down the hole and grab the animal head on the floor which you will use later one. Exit the way you came and return to the jungle path where you left your bike. Continue along the jungle path to reach the building which leads to the 2nd ring puzzle, self explanatory how you get inside.

2nd Ring puzzle

Spin the centre wheel counter clockwise until the black part on middle ring is next to the black part on the outer ring. Now put the thing you found earlier on the outer spinner, then move it so the black part of the ring is facing about 5 o'clock. this releases the rings so you can turn the very centre ring without moving the others. Once you have done that go back to the centre spinning thing and turn the very centre ring so it is line with 6 o'clock and facing the other black parts. Go back to the outside spinner thing and turn the outside ring back to 6 o'clock, all of the black parts should be all in line with each other now. The whole area in the middle will open up.

This is the first speed demon trophy, race as quickly as you can into this area that opened in the middle by going back the way you game, once you reach the bit where you got the 2nd animal head go down the archway to your left and go through the doors in the floor. If you are too slow it will close and you have to fix the puzzles again. Navigate through the maze area with the bike until you have to ditch the bike.

We are going to list videos for the rest as it's complicated to explain:

Credit to 1araCr0ft for these videos.

GLITCH WARNING:

See here and here for how to avoid 2 really nasty glitches with the final section of this level (credit to Dipsy for this info).