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There are parts of the game where you will not be under the immediate threat of zombies. For the duration of these parts, you must do certain things in order to progress, such as exploring every area to uncover bits and pieces of the story.  You can gather information, read notes, gather food, and even find weapons if you explore properly. You are almost always required to collect all items in any given scene to progress. In certain cases, however, discovering everything is optional and not required to progress to the next part of the story. There are chances to stumble into a small event, such as eavesdropping into someone's conversation, if it pertains to the story. Do everything you think is possible, such as give the food you find to your allies or sit next to them and talk. Eventually, you will hear more of their side and gain objectives for your next mission. Using Lee, you have the option to come off as strongly to one side, strongly to the other, or neutral. This is affected by the choices that you make, in addition to affecting your relationship with Clementine.  Whether or not Clementine is your Lee's first priority is your decision. Every decision you make may or may not hold consequences, so take care if you don't want somebody to be unhappy with you. Choose what you believe is right, then move on. This game is tailored to your choices. Though the first season always has the same ending, how you get there is entirely up to you. There really is no right or wrong choice in this game. The game's setting presents a moral grey area, so be confident in the choices that you make.
Explore every area. Be a model citizen or an antihero.