WordNet (r) 3.0 (2006):

shell game
    n 1: a swindling sleight-of-hand game; victim guesses which of
         three things a pellet is under [syn: shell game,
         thimblerig]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "shell game":
   bingo, boiler room, bucket shop, bunco game, card games,
   chuck and toss, chuck farthing, chuck-a-luck, con game,
   confidence game, crack-loo, crap game, crap shooting, craps,
   fan-tan, goldbrick, hazard, horse racing, keno, lotto, pinball,
   pitch and toss, policy, rouge et noir, roulette, skin game,
   sweepstake, sweepstakes, the numbers, the numbers game, thimblerig,
   thimblerigging, trente-et-quarante