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Slot Mechanics & Game Research

How Slot Games Actually Work

Two games can both have Free Spins or Multipliers and handle them in completely different ways. Slotathon gets into those differences, using the games’ own rules, my own checks and side-by-side comparisons you can try for yourself.

Explore Slot Mechanics

A quick route into the features you’ll see most. Each guide explains the idea, then shows how real games differ.

01

Cascading Reels

A winning group disappears, new symbols fall into place, and the game checks again, so one spin can pay more than once.

Explore Cascading Reels

02

Cluster Pays

Instead of following paylines, matching symbols need to form a connected group. How they connect is part of the game’s rules.

Explore Cluster Pays

03

Free Spins

Free Spins can work quite differently from one game to another. The number awarded, whether they can retrigger and what changes during the feature are all worth looking at.

Explore Free Spins

04

Multipliers

A multiplier changes the value of a win or another part of the game. The interesting question is what it multiplies, and when.

Explore Multipliers

05

Sticky Wilds

These Wild symbols stay in place for more than one result. How long they stick around depends on the feature.

Explore Sticky Wilds

06

Feature Buy

Feature Buy lets players pay to access a bonus feature directly instead of waiting for it to trigger. It’s not available in games offered by GB-licensed operators, and international versions may work differently.

Explore Feature Buy

07

Hold and Win

A feature built around respins and symbols that remain on the reels. Landing another qualifying symbol can restart the counter.

Explore Hold and Win

08

Ways to Win

No fixed paylines: matching symbols on adjacent reels count, usually from the left. In Megaways games the number of ways changes every spin.

Explore Ways to Win

Browse all Slot Mechanics

Behaviour first

Same Feature, Different Rules

A game description might say “Multiplier Wilds”. Useful, but only up to a point. It doesn’t tell you what happens when two of them land in the same win.

In The Dog House, Wilds worth x2 and x3 on the same winning line add up to x5. In Buffalo King’s Free Spins, the same two values are multiplied together to make x6. Same label, different maths.

Names cause trouble the other way too. Tumble, Avalanche and Cascading Reels can all describe the same thing, so I go by what the game does rather than what it’s called.

See How I Research

Three Ways In

Start with a feature, the numbers or a particular game.

01

Compare two games

Face-Off lets you see how two games handle the same feature. Start with The Dog House and Chaos Crew. Both offer Free Spins, but the bonuses work very differently.

Open Free Spins comparison →

02

Check the RTP

Even the same slot can have different RTP settings at different casinos. When I checked Starburst at 11 UK casinos in September 2026, the RTP displayed in the game ranged from 92.05% to 98.05%.

Read the 13-game RTP study →

03

Look up a game

The game guides explain how individual slots work and, for many of them, which RTP settings I found at UK casinos.

Browse game guides →

About Slotathon

I’m Tom Ashby. I’ve worked in online gambling since 2005 and relaunched Slotathon in 2026 to explain how the games actually work. It’s written for players in Great Britain, and longer term I’d like it to help you find games that play the way you like.