fight xaldin in beasts castle and once you there will be a second twilight town go to
where roxas smashes the computer and you'll be sent to the first twilight town go to the
glowing yellow orb and you'll be transported to a distant dimension fight the nobodie with
axel and once axel dies he'll open a portal to the world that never was

revisit the worlds again..

beat all needed bosses

The pages have nothing to do with getting into world that never was. You need to beat all
the organization members from the other worlds first. Also, go into twilight town and go
to the old mansion. You'll meet up with the gang and get in. Eventually, you will be able
to get into the world the never was from there.