All of the themes, features, and payout structures found in online slots, however, vary widely and have a substantial effect on the player's experience & possible winnings. Slot machine gameall slots mobile casinos operate on advanced technology. To guarantee independent and fair results for every spin, most games use Random Number Generators, or RNGs. Numerous paylines—the patterns where winning combinations can appear—are another feature of online slots. Choosing the number of active paylines is a common feature that gives players the flexibility to create custom betting strategies.