game of chance

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A game, usually played for money or stakes, in which the winner is determined by a chance event, as by drawing numbers or throwing dice.

from the GNU version of the Collaborative International Dictionary of English.

• noun a game that involves gambling.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun games, probability A game in which the outcome is at least partly determined by random variables rather than strictly by strategy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a game that involves gambling