Even though slot machines are mostly games of chance, players can use certain tactics to improve their experience & possibly raise their winnings. Selelow deposit slotscting machines with higher payout percentages—also known as Return to Player (RTP) rates—is a basic tip. RTP shows the average amount that a machine returns to players over time; for example, a machine with a 95 percent RTP will eventually return $95 for every $100 wagered. Choosing the Right Machine.