Walk past the first stone pillar in the wall, then climb up onto the ledge and then the ledge above it. Go left and you'll see that the next stone pillar is broken away on this level, that looks like it might be passable and is. Once past it, continue left a bit more until Ico is over solid footing, then drop down. Jump onto the floor only to see demons spilling form a black pool below. Fortunately this time they're only interested in Ico and will await his arrival. Walk over to the platform that extends out into space and continue carefully to the end of it. Carefully head down and do not drop off from it. Look for the window, then postion Ico so he's facing it and swing the chain, until he can jump and fly through the window. Prepare for battle.

It's another relatively easy fight. Just finish them off, then climb up onto either window and push a block into the plaza and jump down after it. Push the block to the left along the wall. When Ico reaches the stairs in the corner, have him move to left and start pulling the block past the stairs and along the wall toward the adjacent corner. Move to the back and push it the rest of the way into the corner. Jump on the block and then and onto the ledge. Follow the fenced in pathway until Ico comes to the chain. Have him climb it, then get up on the ledge, and head around to the right and up the stairs. Next go through the door and back onto a ledge in the Stone Pillar area somewhat above Yorda.

Walk along the ledge until Ico comes upon the ladder. Have him climb to the top, then walk carefully along the ledge. When Ico gets near the gap containing the chain, he should tread very carefully. Have him jump onto the chain and drop down a bit, so that he can swing on the chain and jump over to the other side (don't drop too far down on the chain). Although you can't quite see her via panning with the right mini-joystick, call Yorda and she'll run onto the grey metal plate. Move to the switch and throw it and the plate will transport Yorda across to the other side, and evoke another round of shadow demons. Quickly head back to the chain and jump on to it. Descend without delay and press the 'X' button to drop off. Yorda will most likely be in the portal pool by the time Ico gets to the floor. Have him go over and pull her out, taking a swing or two at the demons as necessary. Take her to the Idol Doors as soon as possible to dispell the remaining shadow demons and then head into the area.