In ICO on PlayStation 3, you control ICO and must manoeuvre through a vast castle with Yorda by your side. As ICO you can run, jump, climb and wield weapons such as a piece of wood or a sword to progress through each area or defeat enemies.
However, because Yorda can only jump short distances and climb a limited number of objects in the environment, it's up to you to help her move beyond these obstacles. You can take her by the hand and guide her, tell her to follow you or ask her to remain in a certain spot until you've solved one of the many puzzles presented throughout the game. Be sure to keep an eye on her at all times though. If Yorda is captured by the shadow creatures, it's game over.
In Shadow of the Colossus, you'll experience an entirely different kind of adventure. Once inside this forbidden land, you must use your sword in areas of sunlight to guide you to each of the Colossi. Journeys to these great beasts are never simple and require detours and exploration, so take your time.
Once you have found a Colossus, your goal is to then figure out its weakness before you attack it. Here's a tip - each of the Colossi dwell in a unique lair or environment and in most cases, the Colossi cannot be defeated without making use of their surroundings. When you have uncovered its weakness, you'll need to act fast by scaling the beast and searching for a glowing symbol on its body to destroy it.