Grid Slots

In recent years, the emergence of grid slots has been evident. With all the major slot providers now offering these types of slot games, we take a lot at the concept, what they involve and what you can expect.

Played on fixed grids with no number of fixed paylines of ways to win, you need clusters (normally 5+) of matching symbols to land a winning combination. Also known as Cluster Pays slots, find a list of all grid engine slots conveniently in 1 place as well as more information on the origin of this concept and what bonus features/extras you can expect. If you’re familiar with these types of slots, check out our 7 best grid slots.

Chris Taylor
Review by

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Best Grid Slots

With most slot developers creating cluster pays slots, there’s more and more games to choose from. With new titles available monthly, all slot sites now offer them to their players.

Developers like Nolimit City, Big Time Gaming, Push Gaming, Play ‘n GO, Pragmatic Play, Quickspin, Relax Gaming, NetEnt and ELK Studios (amongst others) are therefore vying for your attention. Here’s our top 7:

The Border (Nolimit City)


Nolimit City’s first grid slot, The Border takes you to the US/Mexico border as patrol agents take on cartel kingpins. Initially beginning on a 6×6 grid, this controversial game comes with an RTP rate of 96.17% and can be played from 20p a spin across all devices.

With collapses/avalanches, there are various Nolimit City mechanics present including xWays, xSplit, xNudge, xBet and xBomb, the action heats up in the 2 free spins features. They both use the new xCluster mechanic where 2+ unique symbol clusters increase the win multiplier.

The Mule Spins sees xWays symbols infect cluster symbols on the same reel. They also reveal 2 or 4 symbols which infect the split symbols respectively. Lastly, there is a Coyote Spins feature where xWays symbols infection all cluster symbols. xBomb Wilds add their multiplier to all symbols.

Extremely volatile and with a 29.58% hit frequency rate, The Border slot comes with 44,288 x bet max wins. This is the amount of cocaine seized by the border patrol each year.

Jammin’ Jars 2 (Push Gaming)


Whilst Jammin’ Jars was responsible for making grid slots so popular, Jammin’ Jars 2 was released in June 2021 and was 1 of the most anticipated slot sequels ever. Played on an 8×8 grid, this fruity disco boasts a higher than average 96.4% RTP rate that can rise up to 96.6% if you work your way through the Gold Vinyl levels.

With collapses, wild jar symbols with an increasing multiplier and instant prize symbols worth up to 1,000 x stake, there are free spins with wild jars that come with increasing multipliers. The best of the extras is the Collectable Gold Vinyl feature where collect gold vinyl records will increase the level and RTP up to 96.6%.

Level 5 leads to the Giga Jar feature where a Giga Jar up to 4×4 in size lands with an instant prize. 8 Giga Jar spins follow where wilds shift on each spin. This can lead to 50,000 x stake max wins.

Sweet Bonanza (Pragmatic Play)


Played on a 6×5 grid, Sweet Bonanza has a sweets theme and has achieved cult status due to its simplicity. Playable from 20p a spin, wins lead to tumbles for consecutive wins. It comes with a 96.49% RTP rate and 21,175 x stake max wins.

The action focuses on the Free Spins feature where rainbow-coloured bombs contain multipliers up to 100x. If you land more than 1 of them in a win, the values are added together. You can also retrigger the feature for unlimited free spins.

Reapers (Print Studios)


Print Studios’ first grid slot, Reapers, is a mashup between an online slot and arcade video game. Played on an 8×8 grid, you head to a distant galaxy in order to banish critters. Spin away from 25p a spin on mobile, tablet and desktop devices.

With a 96.47% RTP rate, collect Energy Cells to shut down barriers which, when all 15 are shut down, will trigger the Bonus Game feature. There are also Special Ability features which makes it easier to progress and collect wins.

In the Bonus Game feature, you aim to collect Energy Cells through the 5 levels. Each level comes with more rewarding critter symbols for larger potential payouts. With 20,000 x bet max wins, Reapers is like nothing you’ve ever come before.

Cluster Tumble (Relax Gaming)


Head to a Himalayan temple in search of lost treasure in Relax Gaming’s Cluster Tumble. Played on an 8×8 grid, you join a Lara Croft-style adventurer from just 10p a spin. With cascading wins, it has a 96.4% RTP rate and 20,000 x stake max payouts.

Winning clusters unblock blocked positions which can lead to 64 symbols in total. Special Stone Blocks can also become active which target symbols to give you a win or transform them to increase your chances of winning. Unlocking all positions will trigger the Free Spins feature where the multiplier increases by 3 each time all blocks are cleared.

Golden Glyph 2 (Quickspin)


Another anticipated sequel is Golden Glyph 2 by Quickspin. Played on a 7×7 grid, you head to ancient Egypt. Playable from 20p per spin, the RTP is 96.09% and the maximum win is 26,800 x your total stake.

With tumbling reels, wins including Power Glyph symbols will trigger Power-Up features. This will bring in colossal wilds, random added wilds and removal of symbols in a pattern. There are also free spins with a multiplier wild that can increase up to 50x.

Star Clusters Megaclusters (Big Time Gaming)


This section wouldn’t be complete without a game from Big Time Gaming. My choice is Star Clusters Megaclusters which begins on a 4×4 grid. With a gemstone theme, it has a high 96.54% RTP rate and max wins of 23,960 x your total stake.

With reactions, there’s a Gold Wild Multiplier which sees the value increase by 1 with each win/reaction. 5 successive wins will activate the Free Spins feature where each time the Gold Wild Multiplier reaches a multiplier of 10, you get more free spins. It’s played on an 8×8 grid with winning symbols splitting to give you 256 symbol wins.

What are grid slots?


Grid slots are different to traditional 5×3 slot games (the most common setup). You’ll literally see a grid of symbols ranging from 3×3 up to 9×9 in size. There are no traditional paylines or ways to win as such. Wins consist of landing matching symbols in a cluster formation.

This means the symbols need to be adjacent to one another. Symbols need to be touching either horizontally, vertically and/or diagonally. The bigger the cluster (the more matching symbols), the bigger the payout/win. This concept is similar to the one used in puzzle game Candy Crush Saga.

What was the first grid slot?


There is no slot game that has been confirmed as the first to be a grid slot. Since starting in 2010, the earliest game I’ve come across that uses this format is Aloha! Cluster Pays by NetEnt.

However, it was Push Gaming’s Jammin’ Jars that put grid slots on the map. Released in September 2018, this 70s, disco/fruit inspired game broke the mould. Played on an 8×8 grid, the fun element, RTP of 96.83% and wins of up to 20,000 x stake have ensured Jammin’ Jars is a cult favourite.

How do you win in grid slots?

With a standard video slots, wins are created by landing matching symbols on successive reels starting from reel 1. With grid slots, a win is created when you see a cluster of matching symbols adjoined to another one another, in whatever direction.

Commonly known as Cluster Pays, this brings the first bonus feature into play. Winning symbols normally then disappear and give you a cascade/tumble with new symbols filling the newly vacated spaces. If you get another win, the process repeats itself until no more new wins are formed.

Whilst tumbles were found in NetEnt’s Gonzo’s Quest back in 2011 and cascades are used in most Megaways slots, all grid slot games deploy this giving you the chance to win again and again from each spin. Big or specific cluster combinations can lead to bonus features and other extras to come into play.

Bonus features

With most grid slots, there are certain bonus features that appear frequently.

The most common is cascading wins, tumbles or avalanches.

When a winning cluster is created, the winning symbols disappear to be replaced by new symbols. This allows for consecutive wins if you manage to get successive winning clusters. This can lead to big wins or triggering more bonus features such as an increasing multiplier.

Another popular choice is a bonus meter/collection system. A winning cluster can contribute to a meter which can in turn bring in various types of wild symbols, cash prizes or bonus features. If you take Quickspin’s Golden Glyph, wins can lead to Power Wild symbols which in turn bring in Power-Up features that gives you more wilds and removes certain types of symbols.

In Viking Runecraft (Play ‘n GO), wins charge the meter to bring 1 of 4 Charge of Destruction Bonus feature into play.

The most typical extra is a free spins feature. They are normally triggered by landing scatters or by achieving a certain number of consecutive wins/reactions. The free spins normally combine all features found in the base game in a more lucrative way.

If you take Big Time Gaming’s Cyberslot Megaclusters for example, the grid expands from 3×3 to 9×9 in size with roaming wilds increasing the multiplier.

Scatter pays slots

Normally referred to as a grid game, Scatter Pays slots differ in the way that winning combinations are formed. With grid slots, you need a certain number of matching symbols to appear adjacent to one another (i.e. in a cluster).

With Scatter Pays slot games, matching symbols can appear anywhere on the grid. This means the identical symbols don’t need to be adjacent/touching in any way. You could have 1 symbol on each reel for example. The most popular Scatter Pays slot is Sweet Bonanza by Pragmatic Play.


The explosion of grid slots has been noticeable in recent years. With all slot providers now offering games with cluster pays mechanics, more innovation and better slots are being produced all the time.

All the best casino sites offer grid slots which helps and there’s plenty more coming. Nolimit City have already released their first title (The Border) so expect new features, ideas and concepts in the near future.


What is a grid slot?

A grid slot is a game played on a grid-like setup ranging from 3×3 up to 9×9 in size. More importantly is how winning combinations are formed. They involve landing clusters of symbols which are connected horizontally, vertically and/or diagonally. The bigger the cluster, the bigger the win.

What are the best grid slots?

The most popular games include The Border, Jammin’ Jars and Jammin’ Jars 2, Reapers, Golden Glyph 2, Sweet Bonanza and Cyberslot Megaclusters. Check out our top 7 grid slots.

Who makes grid slots?

Grid or cluster pays slots are being made by all the top slot providers. This includes Play ‘n GO, Big Time Gaming, Pragmatic Play, Quickspin, Relax Gaming, ELK Studios and Push Gaming.

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