Your next task is to get them over to the dangling rope that Ico most recently cut. Head straight down the stairs. Turn right at the bottom and make your way around and down to the lower floor. First head out back to the main gate area and sit on the stone couch and save your game! Then come back in and turn to the left and head through the nearby arch. Walk left across the three graves and you'll see the rope hanging over near the far corner. The easiest way to progress is as follows: Have Ico climb up high enough on the rope so that his feet are about level with the top of the arch of the second window. Ensure that his back is to the window, then simply jump. He'll jump through the window and land on the ledge behind, which is the exact result you need.

Walk along the ledge to the right into the next room. Turn right and climb over the small ledge, then walk over to the box and push it past the ladder and off of the ledge down into the next room. Climb down the short ladder and drop off the end. Pull the box left toward the wall with the windows, then pull it along the wall toward the open window. Stop when you get there and push it through the open window. Take a step forward and call to Yorda. Ico will lean down and extend a hand to Yorda, who'll grab it and be pulled up. Take her over to the right corner and up the stairs. Have her open the Idol Doors, then take her hand and go on through.