Return-to-player (RTP) percentage, which shows the average amount a player can expect to win back over time, should be one of the first factors taken into account. guru slotsFor example, a slot machine with a 95% RTP should theoretically pay out $95 for every $100 wagered. Although this number is not a guarantee for specific sessions, it is a helpful standard by which to compare various machines. Since they typically provide better long-term odds, players should look for machines with higher RTPs.