A game or test of skill which is comprised of three principal components: a playing surface that either conceals or suggests a secret pattern of paths, a probe for selecting points on the playing surface, and an indicator that reveals whether a selected point belongs on the pattern of paths. In a preferred...http://www.google.es/patents/US4103895?utm_source=gb-gplus-sharePatente US4103895 - Concealed pattern detection game
