Down on your luck, alone and broke, you can always turn to the one place that can change your luck from downtrodden poverty to stinking rich in a matter of minutes - a casino! Once Upon a Time in Chicago is a rags-to-riches mini-game collection set in prohibition era Chicago. It sounds like it has the makings of a grand adventure, but this is one casino story we're not betting on.The main gameplay mechanic that uncovers mini-games is similar to Bingo or Keno. You'll be given six different numbers each round, and you'll match those numbers to another set of numbers displayed on the mini-game cards. When you match all the numbers on a card, it flips over for you to play one of the mini-games.