Thread:Gsimenas/@comment-5105419-20130501113234/@comment-6697950-20130502135934

Pretty much as Insanemaster said. I can even give the quote from the LN:

『Then I will show you evidence that this is the only reality. In your inventories, there will be a gift from me. Please confirm this.』

.........

It was possible, making all the avatars of the players an almost perfect polygon replica of themselves. The purpose of this was also almost too clear now.

“...Reality,” I muttered. “He said that this was reality. That this polygon avatar... and our HP was our real body and our real life. In order to make us believe this, he's produced a perfect copy of us....”

If you really liked the anime, I'd advise going through the LN as well. Quite a few details are explained there and some of the details were cut out off the anime.

Edit: If you have any other questions about the story or any detail of it, feel free to ask. We have a lot of experts on call :D. Though do try to bring these questions up on talk pages or the forums. We seriously go off topic when it comes to wall messages...