Play Billy And Mandy Spell Book. The three weird yet interesting cartoon characters, Billy, Mandy and Grim are in a big trouble in this game, apparently. But theres no problem because you love them, as weird as they can be, and you also love playing games with them, getting them out of the troubles they so often get into. This time, Billy, Mandy and Grim made a huge mess in the house, and they must clean everything before their dad gets back home from work, he would be very angry and punish the kids. So, lucky they have you and Grims spell book, because they can use the book to make a spell and get things back to normal.