Online Slots Guide

What are online slots?

Slots (or “pokies”, “fruit machines”) are games where you spin reels and try to land matching symbols on paylines. You choose your stake and number of lines, then spin. Wins are paid according to the game’s paytable. Online slots use a random number generator (RNG), so every spin is independent and outcomes cannot be predicted. They are games of chance, not skill.

RTP (return to player)

RTP is the percentage of wagered money a slot is designed to pay back over the long term. For example, 96% RTP means that over millions of spins the game would return £96 for every £100 wagered—the rest is the house edge. RTP is theoretical; in a short session you can win or lose more. Licensed games display RTP in the info or paytable. Higher RTP (e.g. 96–98%) is generally better for players than low RTP (e.g. 92%).

Volatility (variance)

Volatility describes how often and how big wins tend to be. Low volatility slots pay smaller wins more often, so your balance fluctuates less. High volatility slots pay less frequently but can deliver larger wins (or long dry spells). Medium volatility sits in between. Choose based on your budget and preference: low vol for longer play and steadier action, high vol if you’re comfortable with risk for the chance of bigger hits.

Paylines and ways to win

Traditional slots have a set number of paylines (e.g. 5, 10, 20)—lines across the reels where matching symbols pay. Many modern slots use “ways to win” (e.g. 243 or 1024 ways): you don’t choose lines; you just need matching symbols on adjacent reels from left to right (and sometimes both ways). More ways usually means more chances to land a combo, but the paytable and RTP matter more than the number of lines or ways.

Bonus features

Most slots include extra features that can boost wins or add variety:

• Wilds – Substitute for other symbols (except scatters) to complete winning lines.
• Scatters – Often trigger free spins or bonus rounds when you land a set number anywhere on the reels.
• Free spins – A set of spins (sometimes with multipliers or extra wilds) that don’t use your balance. Winnings may be subject to wagering if you got the free spins from a bonus—see our wagering guide.
• Bonus rounds – Pick-and-click, wheel, or mini-games that can award cash or more spins.
• Jackpots – Progressive jackpots grow with play across many players; fixed jackpots are set amounts. Both are usually hard to hit.

How to choose a slot

Consider your budget, how long you want to play, and what you enjoy. Check the RTP in the game info—we favour licensed casinos that show it clearly. Use the volatility to match the game to your style: low for steadier play, high for bigger potential wins and risk. Try the demo (play for fun) first if the casino offers it, so you understand the rules and features before risking real money.

Slots and bonuses

Many casino bonuses and no deposit offers count slot play 100% toward wagering, while table games often count less or are excluded. If you’re clearing a bonus, stick to slots (or other games that count in full) and check the game weighting in the terms. Our wagering requirements guide explains how rollover works.

Where to play

Only play at licensed online casinos (e.g. UKGC, MGA). We list and review sites on our best online casinos and casino reviews pages. Check that slots from trusted providers (e.g. NetEnt, Microgaming, Pragmatic Play) are available and that RTP is disclosed. Never gamble more than you can afford to lose—see our Safe Gambling Guide.