Lex is a bookworm.He is always hungry so you must keep him well fed. You can do this by forming words from the letters on the screen. If you feed him too many short words he'll send down burning letters that could set the entire library on fire, so watch out to form long words from time to time. There are 2 modes available:classic mode(no time) and timed action mode. Your progress is saved automaticaly so you can continue from where you left off.