Stand in the center of the calendar and insert the head of the jaguar in a proper place. Now you have to manipulate the lever, which is located inside the circles and the podium, which is located outside. The markings should be placed in such way to form one line (look at the screen).
Go outside and go back to the motorbike. Drive evading holes and traps. You will reach the junction, where you have to turn left. At the end of the road, park the motorbike near the stairs and go further on foot.
You will reach a large temple complex which is full of the mercenaries and giant cats. Kill them all.
Approach the columns which are located opposite the complex. Get close to the column which is located maximally on the left and look up. You will see the bar. Start climbing on the column and take the bar.
Approach the column, which is visible on the screen and place the bar in hole. Then jump on it and begin moving up. From there jump on the column, which is located on the left side.
Walk around the column and jump on the wall in the place from which you will be able to see protruding stones. Move on them maximally right and from there jump on the beam which is located between two following pillars.
Use the beam to move forward and jump on the column which is located on the right side. Stand on the broken beam, which is protruding from it and jump in the direction of the beam which is located on left.
When you jump through another beams, you will reach the wall. When you do this, slip down. You should see the big pillar with bars. Use them to climb on the top, jump forward and clutch the edge which is located above you.
Slip down on the line to the bottom.
Run on the other side and go up. You will see the metal roundel in front of you, which you have used a while ago. Fire the hook in its direction and go right till the line will touch the stone block in the center. Now pull the line. The block will fall down and destroy the floor leading to the next room.
Approach the hole from the right side and slip down.
After that jump on the column which is located behind your back and use it to slip down. In the opposite corner of the room you will find the altar. Take the head of the jaguar from there.