Real money slots come in many different themes & styles, ranging from traditional fruit-themed machines to cutting-edge video slots with bonus features & sophisrummynticated graphics. Volatility and Return to Player (RTP) are two key ideas in real money slots. The average amount of money wagered and returned to players by a slot machine over time is called the return on percentage, or RTP. For example, a slot machine with a 95% RTP will typically pay out $95 for every $100 wagered.