Cluster Slide Slot Review
by ELK StudiosReleased Mar 23, 2021
Free demo - play instantly in your browser
Alien-planet cluster slot with leftward slide gravity and 5 Feature Wild types released from a Generator meter. 96% RTP, 10,000x max win.

Specifications
| Game Type | Slots |
|---|---|
| RTP | 96% |
| Volatility | High |
| Max Win | 10,000x |
| Grid | 7x8 |
| Paylines | Cluster Pays (5+ connected symbols) |
| Min Bet | $0.2 |
| Max Bet | $100 |
| Hit Freq | 38.7% |
Cluster Slide Slot Overview
An alien planet of furry, jelly-textured blocks, played on a board that leans. That lean is the point. When a winning cluster clears, whatever survives falls straight down and then slides left into the gaps, so the grid keeps packing itself into the bottom-left corner while fresh symbols pour in from above.
Under the fur it is a 7x8 cluster game, five connected symbols and up, stakes from 0.20 to 100. The part that runs the round is the Generator above the grid: winning symbols fill its meter, a full meter banks a Feature Wild, and those banked wilds are what turn a two-cluster spin into a chain that keeps going.
Theme & Design
The grid sits inside a slab of pale blue crystal, cut at an angle so the whole thing tilts, planted on rust-red alien plains under a purple night sky. A big red banded planet hangs at the left with a small green moon marbled with swirls drifting in front of it, and a second violet world climbs behind the ridge on the right. Little orange mushrooms and blue sprouts glow along the bottom edge. Cute rather than cool, and it works.
Symbols split into two clear families. The highs are chunky fur blocks: a red one wearing a gold crown over a drooping moustache sits at the top, then magenta coral tufts, orange flame fur and mossy green. The lows are glossy jelly cubes in yellow, green, purple and red. At avalanche speed the purple jelly and the magenta fur read as the same block more often than they should, and on a 56-position grid where you are eyeballing cluster shapes that costs you. Wilds are lettered W tiles ringed with beads, the Bonus is a frosted white B, and the Generator sits in the top-left of the frame as a ring around a W gem with the multiplier plaque facing it from the other corner.
Symbols & Paytable
| Symbol | Payout |
|---|---|
| Wild (beaded W block) | 1x for 5, 10x for 10, 500x for 15+Pays as the top monster and substitutes for everything except the Bonus and the Feature Wilds |
| Crowned moustache monster | 1x / 2x / 3x / 5x for 5/6/7/8, 50x at 12, 500x for 15+Top symbol, and the one the 25x X-iter mode collects |
| Fur monster, second tier | 0.8x for 5, 8x at 10, 300x for 15+ |
| Fur monster, third tier | 0.6x for 5, 4x at 10, 150x for 15+ |
| Fur monster, fourth tier | 0.5x for 5, 2.5x at 10, 100x for 15+ |
| Jelly cubes, upper pair | 0.15x for 5, 1x at 10, 4x for 15+The four jelly blocks share two pay tiers, two symbols each |
| Jelly cubes, lower pair | 0.1x for 5, 0.8x at 10, 3x for 15+ |
| Feature Wilds (Multiplier, Removing, Upgrading, Random, Big) | no payout of their ownFire their function when part of a winning cluster, then leave the grid |
| Bonus block | no payout of their own3 or more anywhere on the grid trigger Wild Drops |
Features & How They Work
Falling, then sliding
Wins pay, the cluster clears, and the board settles in two moves: everything drops vertically first, then slides left until it hits an obstruction. Feature Wilds are the exception, they hang on long enough to execute before being cleared. New symbols fill from the top and the cycle runs as long as fresh clusters keep appearing.
That sideways step does more than it looks. Blocks that were three columns apart end up neighbours, so clusters re-form horizontally instead of the tidy vertical restacking a plain tumble gives you, and the empty space collects in the top-right corner where the incoming symbols land in a fresh block rather than dribbling in one at a time. It is the difference between a board that resets and a board that reshuffles.
The Generator and the inventory
At the start of every symbol drop the Generator picks one of the five Feature Wilds at random and displays it. Each symbol in a winning cluster fills the meter one notch, with wild symbols counting only once. Fill it and that Feature Wild is banked into the inventory beside the Generator, which then resets with a new random type.
Banked wilds do not land immediately. They sit there until the avalanche runs out of wins, and only then does the inventory empty, each stored Feature Wild replacing 1 to 4 random paying symbols with copies of itself. That usually restarts the whole chain, which is why a round that looked finished often is not. The meter wipes at the start of the next round, so none of it carries over.
Five Feature Wilds, one queue
Multiplier adds 1 to the round multiplier and turns into an ordinary wild. Removing deletes every copy of one random symbol type from the grid. Upgrading promotes all of a random type one rung up the pay order, and if that type is already the top monster it picks a different one. Random converts 2 to 4 paying symbols into wilds. Big expands a random symbol into a 2x2 block.
All five fire only when the Feature Wild is part of a winning cluster. When several trigger together they run in a fixed order: Multiplier, Removing, Upgrading, Random, Big Wild. That order is not decoration, since Removing strips the board before Upgrading chooses its target, and Big is left picking from whatever is standing at the end. Generate five Feature Wilds inside one round and an extra x5 is added to the total multiplier, which then applies to every cluster that follows.
Wild Drops
Three or more Bonus blocks send you to Wild Drops, though it only starts once the avalanche has stopped and the inventory has been emptied. Drop one turns the Bonus symbols themselves into wilds and scatters three more single wilds. Drop two places two 2x2 wilds. Drop three places one 3x3 wild, nine positions of guaranteed substitution on a grid that needs five connected to pay anything. Each drop plays through to exhaustion before the next begins.
Three more Bonus blocks during the round add another three drops, and the whole thing pays out at the end. Generator progress and the multiplier are persistent going in, so a bonus triggered off a hot round with x6 already on the plaque is worth several of the ones that trigger cold. Three drops is short by cluster-bonus standards and it shows.
X-iter buys
Five purchase tiers, base game only. At 15x the stake you get three symbol drops with the multiplier already sitting at 5x. At 25x, three drops where every moustache symbol, winning or not, is put to sleep and stacked at the bottom of the grid, then woken up on the final drop to pay at once. At 50x the same trick with Feature Wilds instead. At 100x, a guaranteed round with 3 or more Bonus blocks and entry to Wild Drops.
The top tier is 300x for the Super Bonus, five Wild Drops each with its own wild pattern, retriggering in fives. That is cheap for a top-tier buy, and the return is quoted at the same 96% across every mode, so the buys are not the usual RTP trade-off.
Screenshots

How Cluster Slide Plays
Something pays on better than a third of spins here, 38.7% by the game's own reckoning, which is roughly double what most of this studio's output manages. Pair that with 96% back (their later games sit at 94%) and this is one of the gentlest things in the catalogue. The balance walks down rather than falls. But the frequent hits are not generous hits: five jelly cubes return a tenth of the stake, so plenty of those wins are just noise with a sound effect on top, and the fair description is that the game keeps you in your seat, not in profit.
The tension lives in the meter, not the bonus. Every round is really the same question, which is how many times the Generator fills before the board goes quiet. One fill is a shrug. Three or four and the inventory release starts feeding itself, because released wilds build clusters, and clusters fill the meter again. Five is what everyone is chasing, and it is close enough to reachable that reaching for it feels reasonable rather than delusional.
The 10,000x is a multiplier story rather than a cluster story. Look at where the paytable cliffs: the top monster pays 15x for eleven connected and 50x for twelve, then 500x at fifteen, and clusters that size do not assemble without a pile of wilds sitting on the grid first. Realistically you will spend most of a session in the base game, watching the meter, and that is where the game is at its best anyway.
Pros & Cons
Pros
- The left-slide gravity changes how clusters re-form, rather than being a cosmetic twist on tumbling
- 38.7% hit frequency and 96% RTP make the base game unusually steady for this studio
- Five Feature Wild types with a fixed execution order, so combinations resolve differently each time
- Super Bonus at 300x is cheap for a top buy, and all X-iter modes hold the same 96%
Cons
- Most of those frequent wins are tiny: a five-block low cluster returns 0.1x to 0.15x
- Three Wild Drops is a short bonus, and it pays modestly unless the multiplier walked in with it
- Purple jelly and magenta fur look too alike once the avalanches get moving
- Nothing carries between rounds, so a meter left one notch short of the fifth Feature Wild counts for zero
Is Cluster Slide Worth Playing?
Plenty of studios were circling the same idea in April 2021: cluster grid, charging meter, a set of wild types with jobs. This one got further than most because the sideways gravity changes the math of how clusters build instead of just looking different, and because the Generator gives every round a target that is not the bonus. Wild Drops is the weak link, three drops and out unless it retriggers, saved somewhat by the multiplier carrying in.
What has aged best is the number nobody thought about at the time. A 96% return is a different animal from the 94% builds that came after, and it shows in how long a balance survives a bad run. For my money that alone puts it ahead of several newer, tighter releases wearing sharper graphics.
Frequently Asked Questions
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Reviewed by Arina, PR & Content Manager
PR & Content Manager at SlotsReach
Published 31 Jul 2026 · Updated 31 Jul 2026