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A blackjack game. The goal is to get closest to 21 without going over. If your score is higher than the dealer or he busts, then you win. To hit a blackjack, you must score 21 in 2 cards.
21 was released on June 1, 1976.
21 is available on Arcade.
Yes — 21 supports Multiplayer.
21 was developed by Micro Games.