A slot can look simple while its rules contain several different systems. The paytable explains what symbols pay, how the stake is calculated and whether a feature has an additional cost. RTP describes a theoretical long-run return; volatility describes how unevenly results may be distributed. Neither tells you what will happen on your next spin. Start with our RTP explanation, then look at volatility and the features listed in the exact game you open. Similar-looking games can use different rules and configurations. Bonus rounds, free spins and jackpots also have their own conditions. Our guides focus on understanding those details, rather than recommending a stake or suggesting that a machine is due to pay. Before playing, set a spending limit, read the game information and stop when your time or budget is used. If you want a different example of probability, the Plinko explainer describes another format.