Black or Red Game of Chance
Puzzle 20 of Beat the Heat Pack
Question is: Black or Red Game of Chance
and the answer is: ROULETTE
Word Meaning:
ROULETTE — (uncountable) A game of chance in which a small ball is made to move round rapidly on a circle divided off into numbered (usually red and black) spaces. When the ball stops, it indicates the result of a variety of wagers permitted by the game.
Definitions from Wiktionary.