The idea behind the game is to match pairs of identical images to remove them. You have to memorize the picture on each card in order to win the game. Memorize challenges your memory!
Eidetic memory, is the ability to retain a highly detailed mental image of something not in sight, normally fades before puberty. Eidetic memory is the ability to recollect an image so vividly that it appears to be real. German eidetisch, from Greek eidos See weid - in Indo - European Roots. of visual imagery of almost photographic accuracy.
People capable of eidetic memory, or eidetikers, are therefore able to recall vivid images within their mind and examine these images as one would examine a photograph.