The $20 roulette strategy, otherwise known as the Martingale Strategy is an almost guaranteed way to make sure you win at the casino with $20.

One bettor won more than a half-million dollars by hitting an insane parlay during Championship Sunday in the NFL. The lucky winner turned their $20 site credit on FanDuel into $579,000 by correctly guessing the winners and exact score of both conference championship games. There's 55 555. There's just 55 555.