Low Variance Slots
Statistically, if you're playing a low-variance slot with a $100 bankroll over 240 minutes you will have a smooth ride. Every once in a while you will win some money but your bankroll will decrease very slowly. Big wins aren't impossible, but it is a statistical outlier. On average, these types of games can be played for a more extended period but your chances of winning are lower as well. Hence why low-variance slots are preferred for wagering casino bonuses. See our list of best low to medium variance slots.