Extropia: Mind Game | 
This book was fantastic! It reminds me a lot of a mix of Sword Art Online and (of course!) Enders Game! Basically, the mc's father and brother have built this virtual reality world that you can actually live in (and die >.>). They were hoping it could be a new way of life but naturally, someone tries to steal it from them! MC has to dive into the world in order to save his family and the inhabitants of not only his world but the VR world as well!
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