In a physical casino, players insert cash or paper tickets with barcodes into designated slots on the machine in order to activate the reels and earn credits according to the paytable. Most slot games have a theme and feature symbols that align with that theme, from classic fruits to stylized lucky sevens. Online slot machines have taken the concept even further, with bonus features, random number generators (RNGs), and a wide variety of symbols and payouts.
A winning combination in a slot game is determined by the number of matching symbols that land on a payline, usually indicated by a solid line across the screen. Many modern slots are multi-payline, featuring 243 or 1024 ways to win. The paytable located within the slot game screen explains how these lines work, features information on winning combinations, and lists the odds of each symbol landing in a particular location on the reels.