(under subclass 236) Games in which the participants assume the alternate roles of attacker and defender or code maker and code breaker, the defender or code maker positions a plurality of distinguishable contest elements or the equivalents thereof into various selectable and defined locations on a portion of the pattern which is visually hidden from the view of the attacher or code breaker, the attacker or code breaker then attempts, by a series of arbitrary or calculated guesses, to determine the precise locations (and, often, the type) of the defender's or code maker's prepositioned contest elements.
