The terms 'high volatility' and 'low volatility' refer to risk level respectively. It also refers to how often a game will pay. High Variance Games: higher risk - less frequent payouts - larger wins on average Bingo is considered high volatility because of the potential to win higher prizes at a slower rate. You can decrease the volatility by purchasing the maximum number of cards for each game. Low Variance: lower risk - more frequent payouts - smaller wins on average This is a factor when considering the best way to meet bonus wagering requirements. Games with less volatility are better for working toward playthrough when it comes to consistency and increased play time.