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How Online Slots Work
Online slot machines are casino games that can come in many different shapes and sizes. Most options however work the same way. The display will present a set number of symbols on a fixed layout. After placing a bet, random symbols will appear on the screen and these can award payouts based on their rarity.

The best way to understand the rules of slots is to go through the layout and the core mechanics. Most slots are made out of reels with rows of symbols, paylines, and a paytable.

Reels
The slots reels are the vertical columns of symbols. Most games have five reels, but there are also options with three, six, seven, or more. The reels spin after placing a bet and clicking the spin button, which will display random symbols.

Rows
The slots rows are the horizontal alignment of symbols on the screen. The standard slots game has three rows of symbols visible at any time. However, many games display four rows or more. Classic slots can even have only one row.

Paylines
The paylines are set patterns that go across the screen, from the leftmost reel to the right. These can host winning combinations of matching symbols. The number of available paylines depends on the slots game, with most 5-reel games with three rows having 20 lines. The maximum for this layout however is 243 paylines.

Payout Table
Before placing your bet, we recommend checking out the payout table for the game if you are just learning how to play online slots. This will display all of the symbols available and their payouts. You will also find details on special symbols, like wilds and scatters, and information on any available bonus features.

Slots Wins
To form a winning combination, the symbols usually have to be in adjacent positions and on active lines. The size of the payout depends on the number of symbols in the combination and on the value of the symbols. Since some icons are rare, they provide larger prizes when they form a combination on the screen.

For example, let’s take a look at NetEnt’s Blood Suckers II, a 5-reel slots game with 25 lines that pay left to right. This means that matching symbols must land on adjacent positions on the same line, starting with the leftmost reel. The payout is determined by the size of the bet and the symbol paytable.