TheR$20 roulette strategy, otherwise known as the Martingale Strategy is an almost guaranteed way to make sure you win at the casino withR$20. It works like this: Step One: BetR$20 on red, and if the ball lands on red you've won. You then proceed to take your money and stop playing, you've beaten the online casino.
In short, you want to have a larger bankroll than the figure that you ultimately come up with. To be on the safe side, you should have $350 or more instead of justR$250. Play Slot Games here, pick your favorite!