While it's common to think that winning big at slots is just a matter of luck, players can use a number of strategies to improve their chancessattaking-up. com of striking the jackpot. Selecting the appropriate machine is a fundamental tip. There are differences amongst slot machines in terms of their return-to-player (RTP) percentages. The return on investment (RTP) of a machine is a measure of how much money it gives players over time.