What's the Name of That Book??? discussion

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Book of Names
SOLVED: Children's/YA
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SOLVED. Children's Fantasy Series, multiple protagonists from different universes come together [s]
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And the new world I ~believe~ was fantasy but I wouldn't say medieval.

Also, you just made me notice that there's an 11th and 12th book. This is like when I found there was going to be a 7th book after seven years!
The bits I remember were that it involved 3-4 protagonists from very different universes coming together. I think one universe was our own and a girl was running up a tower before she was transported, another was a "digital" world where anything you wanted would magically appear (though the boy in this world runs away and discovers there are actually slaves working hard to make all of that happen), and I'm pretty sure another was a princess who was supposed to marry someone and ran away.
Can't remember any more about it though!