Ico Cheats

Upon completion of the game, not only do you get to control Yorda and have different music, but her subtitles are now in English rather than in hieroglyphics.
Game Shark Codes
Master Code (Must Be On) EC87A648 143ACAF4
Low Enemy A.I. 1C818848 15F6E79D1C81884C 1456E7A51C8A3C70 15F6E79D1C8A3C74 1456E7A5
Save Anywhere [Note] 0CBF92F6 1456B10C4CF6B274 1456E7AE
Press Select to Walk on Air DC938022 142ED6F71C899850 15F6E79D1C899854 1456E7A5
Press Select + X to Return to Normal Walk DC934022 142ED6F71C899850 39A1B0951C899854 91D38BAD
Note: Pause the game and press L2 to save anywhere. When you load the game, you must sit on the couch once so the save menu appears. After that you can save anywhere, even without Yorda.

Some of you may have already noticed it or have yet to notice this little hint I'm giving you. If you're ever stuck and can't figure out a puzzle and there's no danger around for Yorda (like those shadow monsters), let go of her hand and let her wander around. Sometimes she will wander over to your solution or a hint to it. For example, after the gates closed and the queen came to tell me to back off from Yorda I couldn't quite figure out what to do. I was standing by the gate and I noticed that Yorda kept walking up to the unlit torches. I walked up to examine them and found that I could move them. Yorda helped to find the solution to one of the puzzles in the game! So remember, when your stumped, watch Yorda closely!

When turning big wheels, as when shutting off the water, turn from the farthest point to go faster.

Two-player mode (PAL and Japanese NTSC versions)
Successfully complete the game and wait for the credits to end. Once you regain control of Ico, look for Yorda near the seashore. A save prompt will appear after the final ending. Save the game and restart to have Yorda playable using controller two and new music.