Dangerous Reality by Malorie Blackman
Published by Corgi Children’s Books, 2004
So your mum's this brilliant scientist. She's just invented the most awesome Artificial Intelligence system. Its virtual world is the perfect place to forget about real life. Which is exactly what you want. But then a bug corrupts the system. It's violent and unpredictable. This is no ordinary glitch - someone's trying to sabotage it. You need to figure out who, and why. And fast!
What if your life was about to be game over?