Return to Player (RTP) percentage is one of the first things to take into account. The RTP shows the percentage of money wagered that is eventually returned to players; players typically benefitteen pattl from higher percentages. A slot machine with a 96 percent RTP, for example, typically pays out $96 for every $100 wagered. Therefore, for players who want to optimize their possible profits, choosing games with an RTP higher than 95% can be a calculated move. Slot game volatility and variation. The volatility or variance of a slot game is another important factor to take into account.