Example: This video is about how you can create enemies or objects that will happen later in the game, for a game scroll-er. So that way your game will play faster, due to the phone processor, plus you may not want a enemy or moving object, say a moving block or wall that will make sound when it hits the ground to be happening when you are no where near it. If you have an enemy shooting a weapon, you may not want him to make the firing sound, until your near the enemy. If you want a enemy jumping from the sky down and landing on your character, you may not want that to happen, until you are near the placeholder enemy. So you want to make placeholders for your enemies, or objects, then when you hit a line that's not visible, make some placeholders switch to a active enemy, or object when your about to get near it.
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Flowing Video: Save and Load you're score points and room you're in.