"Rules" are the set of instructions and guidelines that are applicable to any given slot. When it comes to online slots, the rules refer to the game itself as well as payouts, bonus rounds and general game requirements. It's best if you understand the rules of each slot you plan on playing before beginning to play it because this will give you the best chance of winning and making the most of the slot. The rules for each game can be viewed on the provider's website or right in the slot info. It's also important to note that the rules may differ from game to game.