I am looking for this book that I read a long time ago (early 2000s). This kid loves playing this certain computer game and is exceptionally good at it. In the game, there was a riddle that went something like "How much dirt is in a hole that has a radius of 33.2 meters and a height of 78.2 meters?" The kid's answer, which was correct: "None. A hole doesn't have anything in it". This particular book had a blue cover.
He beats the game and gets recruited by a guy and joins a think tank. The guy who recruits these kids is actually evil. Every morning, these kids take a "vitamin pill" which actually controls them. This girl tells the protagonist to not take the pill. He slowly realizes that the guy is actually evil.
There was a scene where the protagonist is told to eat the eggs first as it gets cold easier. In the end, all the kids were saved.