(baseball) A game during which the starting pitcher pitches for the entirety of the game, without a relief pitcher. / Used other than figuratively or idiomatically: see complete, game.

(blackjack) A game dealt from a maximum of two decks, without the use of a shoe.

plural of game reserve

land set aside for the conservation of wild animals

(lawn tennis, dated) The first game after the set is deuce.

plural of game-goer

(US, American football) A postseason college football competition.

(game theory) A type of game played on a directed graph whose nodes are coloured by priority.

(idiomatic) A foolish, profitless, or hopeless undertaking.

(sports or figuratively) Critical and having the potential to alter the overall outcome.