Citadel - Compass Puzzle

When you reach the foot of the stairs, a brief cutscene shows an aerial view of the next room. Its elaborately patterned floor resembles a compass rose.

Move around the perimeter of the room and pick up the items sitting on the floor in three of the corners: super grenades...

...a small medipack...

...and normal grenades.

Now examine the 4 pedestals. Each is decorated with a letter representing one point of the compass (N, S, E, and W). The goal is to move each pedestal onto the golden circle at the corresponding point of the compass. Save the game before moving any of the pedestals in case you encounter the bug described in the main walkthrough.

This screenshot shows the movement of each pedestal from above.

You'll probably want to move the 'S' pedestal first, from the far left corner down to the golden circle nearest the entrance. Then the other pedestals won't get in the way, and you won't have to slide it over the west circle, risking the bug described below.

After that, you can move the others in any order. The 'W' pedestal can be moved as shown here.

Then 'N' and 'E' pedestals only need to be moved a short distance onto their respective circles. Once the pedestals are positioned correctly, all 3 doors leading out of the room should open. (The west door is not shown in this screenshot but it should be open as well.)

[Citadel Walkthrough]