Using two very simple puzzle concepts: pentominoes and checkerboard patterns, IQ XOXO was born. The O's and X's have the same function as the white and black squares in a checkerboard puzzle, there should always be an O next to an X in horizontal and vertical direction. On the flip side of each X there is an O. The combination of 10 different puzzle pieces gives IQ XOXO 120 interesting challenges. Give your brain a little love with IQ XOXO!