Hello /lit/, I come desperately seeking your help. I have been scouring book stores

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Hello /lit/, I come desperately seeking your help. I have been scouring book stores near and far from me for over a month now looking for a book I read in 2005/2006, I believe it was new at that time, and cannot remember the title of. Before I go into the description, I would like to offer a $20 paypal reward for the title of the book OR I will buy two copies of it and send you one so you can see for yourself why I have been searching! So, attached to this post is a crude paint image, you're probably wondering what it is. This is what the world depicted in the book was like, it was split into three plateaus. The story starts on the second (middle), this is where the normal citizens live, the farms are located, etc. The boy in the story lives on this plateau. He wishes to see the top of their world, where the wealthy/privileged live, where the farms send their food to. He makes a quite risqué climb to see the top, somehow the story progresses to him falling down to the third plateau and I believe breaking his leg. (Sorry for the crappy plot description, it has been a lot of years) On the final plateau it is basically uninhabited except for scary things and he has to survive off of a strange gelatin like substance he attains from killing the monster-type animals there. I wish I could remember more. Thanks for reading my post any and all help is appreciated, even pointing me to another forum.