Looking for a specific book series about kids playing a computer game and getting sucked in!

Question

I was about 12 when I read this book (so about 11 years ago). I remember the front cover quite vividly so let's start off with that!
The cover has a green circuit board (all of them in the series had a circuit board texture in a specific colour I think) with the title being one word in bold red letters.
At the top right of the cover was a Japanese looking robot looking character (manga style, I believe!)
Now the story. I don't remember a lot but I do remember a group of kids at school (possibly high school) playing a computer game! Now judging by the style of the front cover im betting it was from the early 2000s.
Any suggestions!? I'm sorry it's not a lot to go on!

Answer 1

You may find it's called Cyber Chase, a cartoon series which was later turned into books. The main antagonist is named Hacker.

Cyberchase is an American/Canadian animated educational children's television series on PBS Kids. The series focuses around three Earth kids, Jackie, Matt, and Inez, who are brought into Cyberspace, a digital universe, to protect it from the evil Hacker. Using math in application with problem-solving skills, environment and weather, they are able to prevent Hacker from causing any more harm. In Cyberspace, they meet Digit, a cybird that helps the kids on their mission

....

When three average Earth kids, Jackie, Matt, and Inez accidentally allow the Hacker access to Motherboard, the supreme ruler of Cyberspace, she becomes severely weakened by a virus. The kids are brought into Cyberspace in an effort to protect the world from the Hacker and his clumsy assistants Buzz and Delete until a cure is found. They join forces with Digit, and later many more Cybercitizens that turn out to be great friends who are willing to fight for Motherboard.