These screenshots show how the buttons, doors, and levers work. Specific strategies for each side area, and for dealing with the undead knights, are covered separately.
In the middle of the MAIN ROOM is a floor mosaic depicting the Western zodiac. At the center of this mosaic are four buttons with the same element symbols you saw in the entrance hall: Fire, Earth, Air, and Water.
There are four sets of three doors (12 doors in all) along the outer wall. Stepping on one of the four buttons opens one set of doors. Beyond each door is a lever. One lever in each set opens the door to a new area. The other two levers open trapdoors that that deposit Lara in a trap-filled basement.
To determine which lever opens the "safe" door, examine the carved signs above the lever alcoves (not the signs above the outer doors). The sign near the correct lever will match the sign on the button.
When you pull the correct lever...
...the portcullises open, and you're able to enter the next area. Note that the entrance to the side level is always through the middle door, but it isn't always the middle lever that opens that door.
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