What happens during a free spins feature in an online slot and how does it affect the overall game mechanics?

Free spins rounds are probably the most misunderstood feature in online slots — players often assume they're just "extra chances to win for free," but there's a lot more going on mechanically, and understanding it changes how you read a game.

How the feature is triggered

Bonuses can affect your experience in a meaningful way. When a bonus symbol appears in a winning line during the initial spin, it typically leads to a free spin or a minigame — giving players another turn without an additional wager. The most common trigger is landing a specific number of "scatter" symbols anywhere on the reels — for example, three or more scatters can trigger a free-games feature. Scatters are significant because, unlike regular symbols, they don't have to land on a specific payline to count.

What actually changes during the feature

The core mechanic — online slot machines use RNGs to generate random number codes that determine an unpredictable outcome, and once those codes are locked in with a spin, the result is translated into lights, sounds, and graphics — doesn't change during a free spins round. The RNG keeps running exactly as it does on paid spins. What does change is what the game layers on top of that outcome.

Designers use the free spins round to introduce mechanics that aren't active in the base game. Common examples include:

• Multipliers — wins are scaled up by a fixed or growing factor. Some games let players choose from multiple free-games options, ranging from more spins to higher volatility and bigger multipliers — in 5 Dragons, for instance, multipliers can reach up to 30×.
• Stacked or expanding wilds — wild symbols that cover entire reels, dramatically increasing the chance of a winning combination on any given spin.
• Retriggering — landing scatter symbols again during the free round awards additional spins. Some games feature selectable multiplier levels with retriggers that power even more bonus potential.
• Accumulation mechanics — some slots gather instant prize symbols via collect symbols, and trigger free spins to build a bonus pot that can be awarded on a final spin.

The RTP and volatility angle

Here's the part most players overlook: a slot's overall RTP figure is calculated across both the base game and the bonus round combined. How much a casino pays out in winnings on average over the lifecycle of the game is called the return-to-player (RTP) percentage. In practice, many modern slots are designed so that a disproportionate share of the theoretical return is concentrated inside the free spins feature — meaning the base game is intentionally lean, and the round is where the game "pays back." This is directly tied to volatility: a high-volatility slot will hit the free spins feature less often but pack more potential into it when it lands. Slot payout odds vary based on the individual machine, so two games with similar-looking free spins rounds can behave very differently.

The pay table explains in simple terms what needs to happen for a bonus to activate and what exactly the bonus will be. Reading it before you play isn't optional — it's the only way to know whether a game's free spins round is multiplier-driven, retrigger-heavy, or something else entirely. There is no winning strategy or system for slots — every win is completely random — but knowing how a specific feature works tells you what kind of session variance to expect.

One practical note for Toronto players: stick to operators registered with iGaming Ontario. Regulated sites display both the iGaming Ontario and BetGuard logos, which confirm the site is managed by iGO and regulated by the AGCO. You can verify the full list at the official iGaming Ontario registry. And if the pace of a session ever starts feeling compulsive rather than fun, ConnexOntario (1-866-531-2600) is there — as is BetGuard (betguard.ca) if you want to self-exclude from all licensed Ontario platforms at once. Legal gambling age in Ontario is 19+.