There're two exits from the level area Ico and Yorda are on. The doorway leads into the upper level of the Chandelier Room, which is where you want to go first. The stairway leads down and around the cylindrical edifice they're standing on, where they'll encounter three bombs at its foot and a doorway into the Chandelier Room's lower level. Have them walk to the right from the stone couch across the top of the cylindrical structure and into the upper level of the Chandelier Room. Be careful on the short walk between the circular floor area and the door as Ico can fall off. The object here is to get both of them across to the other side on the lower level, to the Idol Doors, which can be seen from above. Head to the right and walk around the corner. Continue past the chain, that's hanging down from the side of the walkway and stop near the ladder on the wall with the windows. Climb up the windows on the right side to the ledge above, then walk left to the ladder up to the cross beams above. Climb it and carefully walk across the beam towards the center of the room. Move Ico across on the cross bar until he's directly over the chandelier, then have him drop down onto it. It'll break loose and fall onto the bridge below, cracking its support and jarring Ico loose, who lands unharmed on the bridge as part of the chandelier falls down into the depths, while a second section containing two candles, remains on the lower level.

Head back outside to where they began this section and walk past the stone couch and down the spiral staircase to the three bombs below. Pick up a bomb with the 'Circle' button and head through the door into the lower level. Set it down next to the cracked column, that's supporting the bridge. Head over to the nearby part of the chandelier remaining on the lower level. Walk up to either candle and push the 'Circle' button to light the tip of Ico's staff. The end of the staff will then be lit for a few seconds. Run over to the bomb and light it as well by positioning the flame that Ico carries near the bomb's wick. Stand back a bit and the bomb will explode and blow the bridge support away causing one end of the bridge to fall to the floor below.

Take Yorda's hand and exit through the door and climb the circular stairs. Stop at the stone couch and save your game. Walk through the door to the upper level and then straight ahead down the cracked bridge. As they start down, they're attacked by yet another pack of shadow demons. If possible only fight any one that grabs Yorda and head down the bridge as quickly as possible toward the Idol Doors. Once she opens them, the shadow demons will disappear. If one does succeed in grabbing and making off with her, have Ico run as quickly as possible down the stairs, then up the first short set of stairs toward the Idol Doors and turn right and over to the black pool near the hanging chain and pull her out. Either destroy them, which is quite possible, before continuing, or maintain the "only attack the one who's trying to grab Yorda" strategy, and continue heading for the Idol Doors. Once Yorda has opened the Idol Doors, exit through them.