Online Slots: Understanding RTP, Volatility and How to Pick a Game

Slots are the largest game category at GigaCasino, and they vary far more than the spinning reels suggest. Two games can look similar yet behave completely differently once you understand the numbers behind them. This page explains the two figures worth checking before you play - return to player (RTP) and volatility - and how the studios in our library differ. It does not rank individual titles; the grid below lists what is currently available.

What RTP actually tells you

RTP is the percentage of all wagered money a slot is designed to return to players over a very large number of spins. A slot listed at 96.5%, such as Pragmatic Play’s Gates of Olympus in our library, is built to return about £96.50 for every £100 staked across millions of spins - not across your session. It is a long-run design figure, not a promise for tonight. The remaining percentage is the house edge, which no playing pattern changes: spinning faster, betting bigger or chasing a “due” win does not alter the maths.

Use RTP as a rough comparison tool between games, and always confirm the figure on the game’s own info screen, since studios sometimes ship a title at more than one RTP setting. T&Cs apply, and the published RTP should be verified on the operator’s site.

Volatility: how the wins arrive

Volatility (sometimes called variance) describes the shape of the payouts rather than their total. A high-volatility slot pays less often but in larger amounts when it does; a low-volatility slot pays smaller wins more frequently. Two games can share the same 96% RTP and feel nothing alike because of this.

Gates of Olympus is a high-volatility example: its pay-anywhere grid and tumbling wins can sit quiet for long stretches, then land multiplier orbs worth up to 500x on a single sequence. That profile suits players comfortable with swings and a longer wait for the big features. If you prefer steadier, smaller returns and a bankroll that lasts longer per deposit, lower-volatility games are the better fit. Match the volatility to your budget and patience, not to the size of the top prize.

The studios behind the games

The slots at GigaCasino come from a small set of established providers, and each has a recognisable style:

• Pragmatic Play - prolific output with grid-based, high-volatility hits like Gates of Olympus, tumbling-reel mechanics and multiplier features.
• Play’n GO - known for fixed-payline slots and long-running series, with mechanics that reward learning a game’s specific bonus structure.
• NetEnt - a long-established studio whose catalogue leans on clean design and widely recognised classic titles.
• Evolution - primarily a live-casino specialist; you will see its name across the live tables rather than the slots grid.

Knowing the studio is a useful shortcut: once you find a provider whose pace and feature style suit you, its other releases usually feel familiar.

How to choose a slot

Start with two questions: how long do you want a deposit to last, and how big a swing are you comfortable with? Check the RTP on the info screen and treat anything in the mid-90s and above as reasonable. Then read the volatility - high for occasional large hits, low for frequent small ones. Set a deposit limit before you spin, decide a stop point in advance, and stick to both regardless of how a session is going.

For the wider offer, see our bonuses guide and always read the terms attached to any promotion before playing.

18+ only. Gambling is a form of entertainment, not a way to make money or solve financial problems. Never bet more than you can afford to lose, and set limits before you start. T&Cs apply - verify all details on the operator’s site. If gambling stops being fun, see our responsible gambling page for support.