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Grid slots are a form of online slot that utilise several in-game mechanics to produce some of the most highly entertaining features and bonus rounds seen throughout the iGaming industry. This popular style of game, also known as a cluster pays slot, can be found in multiple forms, ranging from games with a fixed-size grid to those that can expand, offering players the chance to engage in bonus features on mega grids. New designs and themes are continually evolving within this niche, giving slot fans many titles to choose from, learn about, and enjoy some serious time spinning the reels on. Take full advantage of our page dedicated to the humble grid slot, and play all these exciting games for free.

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play grid slots & cluster pays slots free

It's one thing being able to read detailed game reviews about grid slots, and cluster pays slots. But we know that the best way to gain a complete understanding of each slot within this niche is to try it out first. We offer a free play demo of each grid slot we have reviewed so that you can get a feel for each game without wasting any money. So, why not start with our latest releases below and then you can go on to explore any slot demo on our portal through the search bar or individual dedicated provider pages.



how do grid slots work?

Each of the grid slots that you play will have its own format and set-up. So this may be a grid that is 8x8 in size and never alters from this layout throughout the game. However, you could come across a game that starts at a 6x6 format and expands with the more wins you hit. Regardless of the layout, most grid slots share many similarities, which we will now look at in more detail.


no fixed paylines

Whilst practically every other version of an online slot you will play will have a set or variable amount of ways to win on each spin, grid slots are completely unique, and you'll rarely see a single payline in play when you're spinning the reels on one. This has proven to be an extremely popular aspect of this slot genre as it doesn't require players to swat up on game rules, working out what's active and what's not.

There are no set paylines when playing a Grid SlotThere are no set paylines when playing a Grid Slot

cluster pays mechanic 

Those new to the grid slots format can often be confused about how you win on these games after discovering they are payline and payway free. Of course, nearly all online slots have to feature a payline to award you a prize, don't they? But this is where the grid slot comes into its own with a unique and thoroughly innovative pay mechanic. Bunches of symbols or "Matching Clusters" are formed, and wins are paid on a grid slot, typically when five or more symbols that match are adjacent anywhere within the playfield. Is bigger better? It is when you're playing grid slots, and the bigger the cluster of symbols you create, the larger the payout will be.

The cluster pays mechanic is an integral part of practically every grid slot you will find onlineThe cluster pays mechanic is an integral part of practically every grid slot you will find online

scatter pays Mechanic 

The scatter pays element of grid slots works much in the same way as the cluster pays engine, but there is one major difference. Rather than the symbols having to be adjacent to each other in a scatter pays slot, they can be anywhere within the playfield for a win to be paid, as long as there is enough in view to meet the requirements on the paytable. This now incredibly popular sub-niche of grid slots first started to gain traction with Pragmatic Play's Sweet Bonanza and has since gone on to be one of the driving forces behind not just content for Pragmatic but for the grid slot genre as a whole. 


cascading reels

Whilst not all grid slots you come across will utilise the cascading reels mechanic, a significant number of these games use this feature as the main catalyst for everything that takes place throughout the slot. This feature tends to be very popular with players because winning symbols disappear from the reels and are replaced with new ones. This can lead to several cascading wins per spin, giving multiple wins, extra chances to trigger a bonus feature, and longer playing time.

Grid slots use the cascading reels mechanic, which can award more wins and additional bonus featuresGrid slots use the cascading reels mechanic, which can award more wins and additional bonus features

how are features triggered on grid slots?

Grid slots opt for several ways to award players their potentially lucrative bonus rounds. The most common method we see used throughout slots, in general, is when a set amount of scatter symbols landing in view will award a free spin feature. Whilst this method is also used in the grid slot niche, the developers of these games have also been a little more creative in how players can trigger the features within them.

Some Grid slots will require you to remove all blocker symbols to trigger a bonus featureSome Grid slots will require you to remove all blocker symbols to trigger a bonus feature

Several grid slot games, such as Relax Gaming's Temple Tumble Megaways, require the player to hit multiple cascades to initiate the bonus. Each successful reaction during these style of slot games will unlock more of the playing grid, with the ultimate prize being a full-size grid and a feature trigger.

Bonus meters are another popular format that slot developers use within this genre. Games that include Play'n Go's Reactoonz have a meter that is filled when consecutive reel cascades take place, and filling all of the bars on the bonus meter will bring the bonus feature into play.

In recent times, ELK Studios have taken feature triggers to a new level in grid slots by adding a bonus ball that needs to be manoeuvred into position through winning combos on the playfield. This has been a revelation for players as new exciting mechanics and ideas are continually being added to the cluster pays market, showing that the niche still has plenty of room for development. 


what modifiers & features are included in grid slots?

It's certainly safe to say that grid slots are action packed with exciting and entertaining features to keep you on the edge of your seat. Throughout the variety of cluster pays slot games currently on the market, you will be able to find a game with the modifiers and features you like the most. We have listed below the typical features you can expect to see whilst playing grid slots.


  • Free Spins: A bonus round that is generally triggered in grid slots by landing a designated amount of scatter symbols, although some slot providers also add unique ways in which a bonus may be activated, such as collection meters or unlocking a played to its full potential.

  • Mega Symbols: Online grid slots like ELK's Dead Man's Gold feature mega-sized block symbols that can cascade down at the start of a spin or during a reel cascade, which can result in enhanced wins.

  • Multipliers: In some cluster pays games and grid slots, a global multiplier may be present that resets between losing spins in the base game but remains constant or can be increased during the bonus round.

  • Multiplying Wilds: These can be present in gird slots in the base games and bonus features. When they help to form part of a winning combination, their value will be applied to the win. In certain games like Retro Tapes, each individual multiplier involved in a win will apply its value to any formed winning combo, making them incredibly valuable and giving players the potential to create some magnificent wins.

  • Roaming Wilds: When a roaming wild is active in a grid slot, it generally moves position when it has helped form a win or at the beginning of each spin. These can be particularly exciting if more than one of them is present on the reels simultaneously.

  • Expanding Grids: Who doesn't love even more chances to win? And when you play grid slots that can grow in size, that is precisely what you get. An excellent example of this would be NetEnt Gaming's Lost Relics 2, where discovering special treasure chests in the bonus round can help increase the size of the playfield from 6x6 up to a massive 10x10.

  • Feature Buy: The number of grid slots, now also categorised as bonus buy slots, has skyrocketed over the years as players want instant access to these highly entertaining bonus rounds. Nearly every cluster slot you now play will have this facility available unless it has been restricted in your jurisdiction. 

best grid slots

With a mountain of slot games to make your way through that fall into the cluster pays slots and grid slots slot category, it will always be a tall order to sift through the good, the bad, and the ugly. So we've given you a helping hand and listed five awesome grid slots that we think you just have to try out and add to your playlist. 


#5 star clusters megaclusters (big time gaming)

Star Clusters Megaclusters

Slot Stats: RTP 96.54% | Max Win 23,960x | Review & Demo

The jury was and is mainly still out for most slot fanatics on whether Big Time Gaming's adaptation of the cluster pays engine, known as Megaclusters Slots, was a worthwhile venture or a bit of a flop. Whichever camp you may end up in, their debut title with the mechanic Star Clusters Megaclusters is still worth exploring. The game features multiplying wild stars, an RTP of 96.54%, and a maximum win of 23,960x bet.

Initially, the gameplay will begin on a 4x4 grid, but each time you hit a winning combination, it will cause larger symbols to explode and turn into four smaller ones. Things get even more interesting if you can trigger the free spins bonus round by hitting five or more consecutive wins in the base game. During this feature, the grid can be expanded up to a huge 16x16 in size, and with the multiplying wilds in play and increasing in value with each win they help to form, players are in with a chance to land themselves a substantial win.


#4 the border (nolimit city)

The Border

Slot Stats: RTP 96.17% | Max Win 44,288x | Review & Demo

Whilst they do love to throw a controversial theme into the mix, provider Nolimit City also knows a thing or two about in-game modifiers and creating popular slots. They have decided to join the party and put their own spin on the grid slot with their new xCluster mechanic seen for the first time in their hit slot, The Border. Along with other features that include xWays and xSplit, this highly volatile slot comes with an RTP of 96.17% and a maximum win of 44,288x bet.

Two bonus rounds can be triggered, the Mule Spins and the enhanced Coyote Spins. Whilst both of these free spin features are more than capable of paying you a good multiple of your stake, the multiplier in the Coyote Spins will not reset between losing spins, allowing it to reach high values that will be applied to winning symbols to produce some monumental hits if you're lucky enough to get a decent setup.


#3 starlight princess (pragmatic play)

Starlight Princess 100

Slot Stats: RTP 96.50% | Max Win 15,000x | Review & Demo

With a reputation of being a prolific provider of online slots in general, developer Pragmatic Play is also well established in the grid slot niche with several outstanding titles under their belt. One such hit release is Starlight Princess, played over a 6x5 reel matrix and operating on the scatter pays mechanic. The game has a solid RTP of 96.50% and offers wins up to a maximum of 15,000x bet.

Tumbling reels feature throughout the gameplay of this cluster pays slot, but the main headline of the game is the free spins bonus round activated when four or more scatter symbols appear in view. A global multiplier is in play during the bonus, which will not reset between losing spins. Each time a new multiplier value is added to it, the whole total will be applied to any winning combinations formed at the end of that series of spins.


#2 reactoonz (play'n go)

Reactoonz slot

Slot Stats: RTP 96.51% | Max Win 4,570x | Review & Demo

If you're fascinated by space travel and meeting alien life forms, then Play'n Go's Reactoonz slot is just the game for you. Played over a grid slot format of 7x7, this action packed online video slot features heaps of modifiers that can help you group huge clusters of winning symbols. Players can also look forward to a high RTP of 96.51% and wins up to a maximum of 4,570x bet. 

You might be wondering how an online slot without a free spins bonus can make it onto a must play list, but once you get spinning the reels on it, you'll soon find out why. So how is it you do win big? Well, you'll need to hit consecutive winning reel cascades to fill the Quantum Meter positioned at the top of the slot. Each canister you fill will award a unique modifier, and if you fill all five, the Gargantua Wild will appear, leading to massive clusters and big wins coming your way.


#1 jammin jars (push gaming)

Jammin Jars

Slot Stats: RTP 96.83% | Max Win 20,000x | Review & Demo

Arguably, the most iconic grid slot ever developed and certainly worthy of the number one spot is Push Gaming's Jammin Jars. Played across a super-sized grid slot format spanning 8x8 and housing 64 symbols per spin, this video slot features an incredibly high RTP of 96.83% and a juicy maximum win of 20,000x the bet.

The base game has a Rainbow Road feature that can randomly trigger on any base game spin, adding huge symbols to the reels for a better chance of hitting a big winning cluster, but the free spins bonus is where you stand to make the big money triggered when three or more scatters land in view. During the feature, multiplying wilds will increase in value when connected with winning symbols. Furthermore, if two or more form part of the same win, their values will be applied separately, enhancing the win to what could be epic proportions. 


grid slots final thoughts

It's no real coincidence that since the popularity of high volatility slots among players has risen, so has the number of grid slots we now see in casino lobbies. These are some of the best styles of games to use for high variance titles, as slot providers can incorporate several different features and modifiers within the gameplay, making it easier to crank up the volatility in the bonus rounds if they wish.

Many older grid slots remain firm fan favourites, with classics like Gates of Olympus and Moon Princess still racking up thousands of spins per month here on our demo platform. However, the next generation of games, which incorporate new and exciting modifications across cluster pays slots and scatter pays slots mechanics, is set to transform this niche of casino games further, making it a style of online game that every punter should experience and add to their playlist when heading for a session on the slots.


Where can I try the latest grid slots without signing up for an account?

We add dozens of new online slots here on our site every week, which include the latest cluster pays and grid slots. These can all be played for free without registering an account or downloading any additional software. 

Can I claim a welcome bonus to play grid slots?

There are several recommended slot sites here at Demoslot that will allow you to claim a welcome offer that can be used on any style of slot you wish to play, including grid slots.

Are all grid slots highly volatile?

Whilst you will find a handful of grid slots that offer low or medium volatility, the majority of the games are classified as high volatile. 

Do grid slots have ways to win and paylines like traditional online slots?

Unlike most regular video slots, grid slots rarely contain paylines. Instead, they operate on the cluster pays or scatter pays mechanic. However, you may encounter exceptions to the rule, with a few Megaways slots doubling up as a grid slot.

Will grid slots offer the same bonus rounds and features as standard video slots?

The good news is that the way grid slots work sees them offer more features and bonuses than the majority of any other online slot. In these exciting games, you'll often find most grid slots have a combination of cascading wins, free spins, increasing multipliers, mystery symbols and multiplying wilds.

Author Bio


Article by Nigel Hall

23 years Gambling Industry Experience

About Nigel Hall >