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I'm pretty sure the story your talking about is The Giver. The boy is Jonas and as soon as he becomes 12, they give the children different tasks to do, and he was selected as the new Receiver. This happened during the Ceremony of Twelve. He wasn't locked up in a dark room though, that was were he was being taught by The Giver and it was more like a work room or library with all the books on history they kept away from the community. Their community was unbalanced though because they only knew of good things, and Jonas was burdened with all the bad things that happened like war and killing, but he also knew of good things that no one else knew, like color. Everyone else saw in black and white and his first colour that he started to see was red. When he found out about how they "release"(kill) the elderly and how this new born was to be "released" because he had the lighter weight between the twins( twins wern't allowed), he was upset about it and he took the baby (Gabe) and hid him. Every time he got new memory, it changes the way he thinks about the community and he stops taking the "medicin" they give everyone. Because Jonas is now aware of emotion and how the government really works, he rebels against the restrictions his society places on freedom of choice, emotion, individuality, and human feelings. So with the help of the Giver, he runs away with Gabe and as he does so, he slowly releases the memory to his community. At the end, it just talkes about how they hear faint music from far away, but it never really tells us what happened in the end, which I found kind of frustrating. But in all, it was a really good book and it is one of my favorites. 
"Crap. I lost my watch, now I'm lost in time."
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