shell game

  1. a game, typically a swindle, in which spectators are challenged to bet on the location of a small object ostensibly concealed under one of three cups or nutshells manipulated by sleight of hand
  2. any scheme for tricking and cheating people

See shell game in American Heritage Dictionary 4

noun
  1. A game, usually involving gambling, in which a person hides a small object underneath one of three nutshells, thimbles, or cups, then shuffles them about on a flat surface while spectators try to guess the final location of the object. Also called thimblerig.
  2. A fraud or deception perpetrated by shifting conspicuous things to hide something else.
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