Walk out to the reflector and you should notice that it's not properly oriented. Push either arm clockwise such that the reflector locks into place and faces toward the building. Now head to the right and climb the ladder, bringing Yorda up along with Ico so that she remains nearby. Head through the door with her. Have Ico jump over to the chain and climb it. Start to the right and head up the stairs and around. Remember to jump over the gap where the drawbridge will be lowered. Have Ico slash the ropes as he encounters them. It appears to be a bit easier to do so with the mace. Once the first one is lowered, continue on to the opposite side and release the other drawbridge in a like manner. Continue on (just as you did in the East Arena) and walk on the pressure switch and then through the door. Run over to the lever and pull it to stop the running water. Run back around the three sides, turn the last corner and go down the stairs. Head to the chain and climb back down to Yorda. Run down the circular incline and drop off the edge and continue to the stone couch and save your game.

Walk over to the staffs and sword leaning against the nearby wall and exchange the mace for a staff. Have Ico lead Yorda over to the ladder, then climb down and call Yorda after him. He should next head up the wide stairs, calling to Yorda once or twice as he goes. Have him walk to the large circular window and climb up onto its lower rim. Call to Yorda and he'll turn and drop to his knees to lend a hand to help her up. Take Yorda out through the window and once on the ground they need to turn to the right and go to the ladder and climb it. Once on the top, send them through the doorway and on inside until Ico is even with the chain. Have him detach from Yorda and run towards the chain and jump on to it. Once he's done this, have him climb to the top. Note the boarded up door! Head to the right and then walk right out onto and across the lowered drawbridge into the next room. Walk over to the left corner and pick up one of the bombs. Note the gap in the fencing! Walk back out of the room, carrying the bomb, and back across the drawbridge. Turn left and walk to the boarded up door. Drop the bomb near the door. Run over to the other end of the ledge and have Ico light his staff from the torch, then run back to the bomb and light it. He should then quickly back away for some distance just for good measure. Boom goes the bomb and blows the boards blocking the door to bits.

Walk back toward the now open door but climb back down the chain to greet Yorda. Take her back down the wide stairs, then up the ladder and over to the stone couch and save your game. Continue out the door and head across the room to the left and go through the doorway into the now dry waterway. Have them both climb up it and proceed out the door. Head to the left and walk through the newly opened doorway. Walk to the right, then turn right and walk across the drawbridge and into the next room again, although this time together. Walk straight ahead to the gap in the fencing and a magic bridge section will appear. Walk together out onto that one and the next one appears. Continue across to the Idol Doors and Yorda will open them. Pass through, then walk to the right and pull the lever to open the two small circles below. Turn and walk down to the other end. Get Yorda on the elevator, then have Ico go to the torch and light it, then quickly get on the elevator too. It'll descend automatically and Ico should then immediately get off and move to the right and light the first small circle. This may take more than one try. Once it's lit, relight the staff from there and head over to the other small circle and light it. This causes the larger circle above to open and the sunlight to stream through from the reflector on over to the orbs above the west gate section and power them up. They then cause the west gate to be enabled and the doorway above the entrance to the pathway above the west gate is now open as is the entrance door to the West Arena, that they entered through. Return to the room on the left side containing the stone couch and have Ico retrieve his mace. Then have them both sit on the stone couch and save your game.