A few of the most common and riddles.Alpha ZXT A logic puzzles derives itself from the mathematical field of deduction and may include some of the world's toughest puzzle which can be solved only by using logic puzzle grid. The most popular example of this is the Zebra puzzle. Surprisingly Lewis Carrol used logic puzzles in his famous book ??Alice In Wonderland??.A riddle, on the other hand, is a statement having a veiled meaning and can be put forward as a puzzle to be solved. Riddles are basically of two types viz:Enigmas:http://www.strongmenmuscle.com/alpha-zxt/