i don’t really remember much about this book but i read it when i was younger around 10? it was about this boy who was in an orphanage/care home and he gets an invitation for a competition (i think?) for a famous video game. Basically he has to do some trials and then he passes and a few other kids win the competition too and they end up going to another world and going inside the video game. It could’ve been just him going by himself though. He has to get a cure for the bosses daughter i think. PLEASE i’ve been looking for this for so long!!
Lost Classics of Teen Lit: Name That Book! 