Games with high volatility generally mean that you’ll win less often, but your wins will be bigger. Volatility : The volatility rating of a slot game determines how often you may be likely to either win or lose.By default, it also depicts how much goes back to players. RTP Rate : The RTP (or return-to-player) rate determines what percentage of turnover from a particular machine goes to the house.Slots for real money : With the number of great slots out there that allow you to play for fun or demo the game, the first obvious criterion is that the slots on this list allow you to play for real money.The following criteria are what we judged each slot game against to determine its rank on the list: © Can Stock Photo / edwardolive The Criteriaīefore we delve into the best slots, let’s explain how we evaluated them.