Video Slots Explained: Wilds, Scatters and Bonus Rounds

Free spins, expanding wilds, cascading reels and multipliers are not decoration - they are where the payout in a video slot actually lives. Here is what each feature does.

Wilds and scatters

A wild substitutes for any paying symbol and is the simplest way to complete a combination. Sticky wilds remain in place for several spins, expanding wilds cover an entire reel, and walking wilds move one reel at a time. Stacked wilds fill a whole reel position and massively increase the chance of a multi-line hit.

Scatters are the opposite: they pay anywhere on the reels and do not need to sit on a payline. Their real job is usually to trigger the bonus round, normally when three or more appear in a single spin.

Free spins and multiplier mechanics

Free spins are the headline feature of most video slots. The number awarded, the multiplier applied and the retrigger rules vary enormously – some games grant 10 spins at 1x, others 25 spins at 5x with the multiplier increasing on every losing spin.

Because free spin rounds are played at the triggering stake, they are effectively extra value with no additional cost. This is why high-volatility titles concentrate so much of their RTP inside the bonus: the base game is deliberately flat so that the feature can be explosive.

Ways to win, cascades and cluster pays

Megaways-style engines vary the number of symbols on each reel on every spin, producing up to 117,649 'ways' rather than fixed paylines. Cascading or tumbling reels remove winning symbols and drop new ones in, allowing one spin to produce a chain of wins.

Cluster-pay slots abandon lines completely and pay when a set number of matching symbols touch horizontally or vertically. All three formats exist to do the same thing: create more chances for a single spin to keep paying.

Frequently asked questions