Head to the left, then go left again across the bridge. Have Ico leave Yorda at the locked door and continue right to the ladder and climb it. Head to the left and then climb up, where there's light streaming through. Continue on down to the pathway below. Head left and align Ico with the chain, then have him jump to the chain. Turn him around 180 degrees so that his back is facing the other side. Swing twice and have him jump at the end of the second swing. Head to the left and climb down the ladder to the ground. Now have Ico walk to the right until he reaches the wall, then turn left and continue until he reaches the box. Have him push it off and jump down after it.

Go over to the elevator in the far right corner. Pull the lever and ride it up to the ledge behind the door where Yorda was left. Get off of the elevator and carefully continue to the right past the door to the lever beyond and pull it to open the door that was blocking Yorda from passing through. Call Yorda, then take her to the elevator and head back down. Have them head back toward the block that Ico pushed off, but stop at the series of stone ledges along the way and climb up them. Head through the door, then down on to the suspension bridge and across to the ledge on the other side. Go to the right and sit on the stone couch and save your game. Then have them retrace their steps utill they've climbed back down the series of stone ledges. Now continue on to the far left corner and the block. Have Ico climb up onto the block then up onto the area above. Next turn him around and call to Yorda, to extend a hand to her and pull her up with him.