Those numbers you put in weren't a password for a game--they get you access to a, well, it's kind of a network. And it can be accessed through anything, from a computer to your game to even a piece of paper, as long as you can put the numbers on it somehow.

[Why is there a child on the network? The teenagers were bad enough, but a kid this young? Hajime's just trying to make sure he understands this isn't just part of the game.]

It's a secret network, and it's got to stay that way, okay? Telling people outside the network isn't safe.