My teacher back in primary read the class a book about an orphan boy that somehow gets like a ticket or something to go test a game by a famous video game maker. There are several kids there, that the main character (the boy) makes friends with, one or two of which were female, the others male, and they basically teleport through this big machine into an alternate universe, which the main character is originally from (I think his last name is Equinox) and they go into the other universe that the gamer supposedly "made" and solve puzzles and stuff. I'm sorry I can't be more descriptive, this is all that I remember really.
The main character is dyslexic I'm pretty sure, and everyone at his school and orphanage hates him.