Differix is a pattern recognition puzzle that can be played as a solo activity, or competitively as a race to see which player can place the most correct tiles in a set time. The various versions of the game have four or six game boards of increasing difficulty that each display nine illustrations with the same motif (ex. an elephant, a juggling frog or a tightrope dancing pig). Each of the illustrations differs from the others in only a minor detail or change of position, so that players are required to scrutinize them closely in order to match tiles and the pictures on the boards correctly. Differix was developed by psychologists and promoted by Ravensburger as a way to develop observation, concentration, and pattern recognition skills in young children. It is also used as an aid in working with children who have difficulty with reading or writing due to dyslexia. Reimplemented by Differix Extrem