Space Stacks Slot Review

4.5/5
Based on our expert’s review. Reviewed by
Push Gaming Slots
Review by
Martin Backhouse
Updated: 07/07/2023
Review by
Martin Backhouse
Updated: 07/07/2023

Head to outer space with the Space Stacks slot by Push Gaming. Played on a 10×10 grid, it uses a MultiBet system called ReelBets. You bet on specific reels/columns to win that would in turn return different payouts. With Enhancements available, there are 3 Feature Blocks which lead to their respective bonus feature. There is also a MAX Block worth 5,000 x bet. With an overall RTP of 96.23%, find out more about this unique and bold game in our Space Stacks review.

Max Win
5,000 x bet
Play
T&Cs Apply

18+ new players only. Minimum deposit: £20. Maximum £100 bonus. Max bet with an active bonus: £2. Wagering requirement 100% match bonus: 30 times sum of deposit + bonus. Max redeemable from welcome bonus: £500. 100 Free Spins are given out 20 per day on Book of Dead for 5 days in a row, log in each day is required. Max Free Spins winnings: £100. Winnings from Free Spins are credited as bonus money with a wagering requirement of 45 times. Free Spins expire after 3 days. Some games may not be played with a bonus. Games may contribute differently when wagering a bonus. Play Responsibly! www.begambleaware.org. #ad

Provider
Push Gaming
Type of Slot
Video Slot
Theme
Outer Space
Reels
10x10
Paylines
MultiBet
Stakes Range
10p to £100
Bonus Features
Yes (5)
Free Spins/Multiplier
NA/NA
Max Win
5,000 x
RTP
96.23%
Volatility
Medium

Space Stacks Demo

18plus uk-gambling-commission online-slot-co-uk-logo agechecked-verification-provider
T&Cs Apply 18+ new players only. Minimum deposit: £20. Maximum £100 bonus. Max bet with an active bonus: £2. Wagering requirement 100% match bonus: 30 times sum of deposit + bonus. Max redeemable from welcome bonus: £500. 100 Free Spins are given out 20 per day on Book of Dead for 5 days in a row, log in each day is required. Max Free Spins winnings: £100. Winnings from Free Spins are credited as bonus money with a wagering requirement of 45 times. Free Spins expire after 3 days. Some games may not be played with a bonus. Games may contribute differently when wagering a bonus. Play Responsibly! www.begambleaware.org. #ad
18plus uk-gambling-commission online-slot-co-uk-logo agechecked-verification-provider
T&Cs Apply 18+ new players only. Minimum deposit: £20. Maximum £100 bonus. Max bet with an active bonus: £2. Wagering requirement 100% match bonus: 30 times sum of deposit + bonus. Max redeemable from welcome bonus: £500. 100 Free Spins are given out 20 per day on Book of Dead for 5 days in a row, log in each day is required. Max Free Spins winnings: £100. Winnings from Free Spins are credited as bonus money with a wagering requirement of 45 times. Free Spins expire after 3 days. Some games may not be played with a bonus. Games may contribute differently when wagering a bonus. Play Responsibly! www.begambleaware.org. #ad

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New Players only. Min deposit: £10, Wager req: 35x deposit bonus,  Bonus will be paid out in 10% increments to your cash account. Account balance is withdrawable at any time. Upon withdrawal, any remaining bonus is forfeited. Max bet is: £10. Play responsibly. #ad

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Space Stacks Slot RTP, Details & Wager Limits

Reels/Paylines: 10×10/ReelBets

Stakes Range: Up to £100 per spin

RTP: 96.23%

Max Win: 5,000 x bet per spin

The Space Stacks slot takes place on a 10×10 grid and uses a MultiBet system. The idea is that you can bet on specific reels/columns to win that would in turn return different payouts based on the type of bet placed. It allows you to split your bet between different Instant Prize Blocks, Bonus Feature Blocks and the Max Block. There are 10 different Blocks to bet on. A win is achieved by filling a particular Block.

When it comes to bet options, you will see 1p, 10p, £1, £10 or £100 casino chips. Click on 1 or more Blocks to add a bet to that Block. There’s also a Bet on All button which, when clicked on, will bet on all in that given selection. In demo mode, the max bet default is £100 but can be configured to get up to £670.

If you select the 10p casino chip and click on the 2 Bet on All buttons, you’ll play at £1 per spin

For non-UK players, there’s an Autoplay function which allows between 10 and 100 autospins. In Settings, there is a Turbo Mode too.

The average Space Stacks RTP is 96.23%. Higher than the average return rate of 96%, there are 95.25% and 94.29% RTP versions. However, the RTP different for each type of Block (more on this below).

The volatility in the medium category meaning a steady flow of wins throughout the slot. The max win is 5,000 x your total bet. Importantly, the odds of winning this is once every 5,205 spins.

Theme – explore the outer riches of space

Theme: Space

High Value Symbol: MAX Instant Prize Block

Compatibility: Mobile, Tablet, Desktop

space-stacks-slot-base-game

With a space theme, the Space Stacks slot lets you explore the outer reaches of space. With a futuristic feel naturally, the 10×10 grid is very clear with the Blocks using bright colours to really stand out from the stars and planets in the near-perfect vacuum that it outer space. The soundtrack has been created using a synthesizer.

There are no symbols as such with only Blocks on the reels. With 10 of them appearing, there are 7 Instant Prize Blocks. The most valuable Block is the MAX Instant Prize Block which pays 5,000 x your total bet. Each Block offers a minimum payout, an average payout and RTP (more information below).

Other symbols/Blocks you see are 3 Feature Blocks. You have Astro, Flip and Apex. They offer bigger average payouts than the above Blocks but a lower RTP (more details below).

Symbol Payouts/Info
space-stacks-slot-blue-instant-prize-block-symbolBlue Instant Prize Block Minimum payout of 2 x bet (Column 1)
space-stacks-slot-purple-instant-prize-block-symbolPurple Instant Prize Block Minimum payout of 2 x bet (Column 2)
space-stacks-slot-green-instant-prize-block-symbolGreen Instant Prize Block Minimum payout of 3 x bet (Column 3)
space-stacks-slot-pink-instant-prize-block-symbolPink Instant Prize Block Minimum payout of 5 x bet (Column 4)
space-stacks-slot-yellow-instant-prize-block-symbolYellow Instant Prize Block Minimum payout of 10 x bet (Column 5)
space-stacks-slot-red-instant-prize-block-symbolRed Instant Prize Block Minimum payout of 50 x bet (Column 6)
space-stacks-slot-astro-feature-block-symbolAstro Feature Block Triggers Astro feature when filled (Column 7)
space-stacks-slot-flip-feature-block-symbolFlip Feature Block Triggers Flip feature when filled (Column 8)
space-stacks-slot-apex-feature-block-symbolApex Feature Block Triggers Astro feature when filled (Column 9)
space-stacks-slot-max-instant-prize-block-symbolMAX Instant Prize Block 5,000 x bet payout (Column 10)

Space Stacks Mobile

space-stacks-mobile-slot

With Push Gaming focuses on mobile players, Space Stacks is available to play on smartphones operating with iOS, Android and Windows software. Created with HTML5 technology, it’s also been optimised for play on laptop, PC and tablet devices.

Space Stacks Bonus Features

The Space Stacks slot comes with 5 bonus features. The ReelBets feature sees you bet on each column. If you fill the column, you’ll win that prize or feature. The Enhancement feature can boost the columns with multipliers and added values. The 3 Feature Blocks give you Instant Prizes by spinning a wheel, picking from a grid or playing an enhanced version of the base game. There’s also a MAX Block which awards 5,000 x bet.

ReelBets feature

space-stacks-slot-bet-selector

As touched on above, the MultiBet system is known as the ReelBets feature. You choose the value of each casino chip you wish to bet. Once you’ve chosen a chip, place your bet on 1 or more betting blocks by clicking or tapping the appropriate betting block.

Every time you click or tap, the amount of your bet increases by the value of the selected chip. There are 1p, 10p, £1, £10 or £100 casino chips. There is also a Bet on All button which is used for all 3 Feature Blocks and the MAX Block or the 6 Instant Prize Blocks.

Enhancement feature

space-stacks-slot-enhancement-feature

The Enhancement feature can apply to all Instant Prize Blocks bar the MAX Block. Here, 1 or more Instant Prize Block values can be increased to a higher value than the initial value. All possible enhancements appear in grey.

The feature randomly chooses 1 or more enhancements each time. This consists of multiplier and additional values being applied to the Instant Prize Blocks:

Multiplier Values 2x, 3x, 5x, 10x, 25x, 50x and 100x
Additional Values +2, +3, +5, +10, +25, +50, +100, +250, +500 and +1,000

Now, the Instant Prize Blocks are multipliers of the bet amount placed on that chosen block. The only exception is the MAX Block which is worth 5,000 x your total bet. If you manage to fill the respective column to the top, that Instant Prize associated with that block is won.

Here’s the minimum value of each Block along with the RTP and average payout:

Instant Prize Block Minimum Payout Average Payout RTP
Blue 2 x bet 2.457 x bet 96.39%
Purple 2 x bet 2.759 x bet 96.35%
Green 3 x bet 4.479 x bet 96.33%
Pink 5 x bet 6.944 x bet 96.31%
Yellow 10 x bet 13.706 x bet 96.13%
Red 50 x bet 65.026 x bet 96.13%
MAX NA 5,000 x bet 96.07%

Feature Blocks

space-stacks-slot-apex-feature

There are 3 Feature Blocks in the Space Stacks slot. If you fill the respective column, you will trigger their respective bonus feature. Here’s what to expect:

Astro feature: this is an Instant Prize Wheel with 32 segments. These include Bet Multipliers, Instant Prizes and Collect. Multipliers range from 2x to 100x and Instant Prizes range from +2 to +1,000. You get to spin the wheel until you land on a Collect segment which then ends the feature.

Flip feature: you will play on a 6×6 grid with selectable prize tiles. Prizes include Rocket symbols and Instant Prize bet multipliers. The latter can be as high as 1,000 x bet. You basically make 3 picks to win prizes. If you land a Rocket symbol, the total win multipliers is unlocked beginning at 2x. Every extra Rocket increases the total win multiplier to 5x, 10x and 100x.

Apex feature: here, you enter a new stacking feature with all 6 Instant Prize Blocks with new values. The starting value of the pots are 2x, 3x, 5x, 7x, 10x and 20x respectively. The Enhancement feature then takes place. Symbols drop and start filling up the columns like in the base game. If you fill a column, that prize will be collected. When a second column is filled, the prize multiplies the collected prize. Then 3 lives are activated. If no symbols land, a life is removed. This continues until all lives have been taken away.

Lastly, here is the average payout of each of the features and the RTP:

Feature Average Payout RTP
Astro 34.232 x bet 96.19%
Flip 64.143 x bet 96.17%
299.335 x bet 299.335 x bet 96.09%

Space Stacks Review Summary – have Push Gaming gone too far?

Ratings
Theme & Symbols








Sounds & Music








Bonus Features








RTP (96.23%)








Max Win (5,000 x)








Originality








The Space Stacks slot is not a conventional video slot by any stretch of the imagination. Hats off to Push Gaming for trying something completely unique and different. They’ve picked the space theme correctly though as they are no boundaries in outer space (that we know of).

At first glance, Space Stacks looks like a grid slot. It’s anything but. The game is all about the ReelBets feature where you bet on 1 or columns/betting blocks. If you manage to fill the column(s) you’ve bet on, you’ll win the associated prize. The Enhancements feature sees Instant Prize Blocks increase in value with addition values up to 1,000 x bet and multipliers up to 100x applied. The only Block not affected is the MAX Block which remains constant at 5,000 x bet.

Then you have the 3 Feature Blocks where you spin a wheel for prizes and play on a 6×6 grid with prizes and Rockets which add win multipliers up to 100x. The Apex feature is an enhanced version of the base game basically with higher starting Instant Prize Blocks prizes (bar the MAX Block).

With an overall RTP of 96.23% and 5,000 x bet max wins, Space Stacks may not offer enough big win potential to pique your interest. However, the volatility is in the medium bracket so it’s not going to send your balance deep into orbit. It’s important to state that the max win is won on average every 5,205 spins. If you compare to Play ‘n GO’s Book of Dead, the max win of 5,000 x bet is achieved every 3.7 million spins.

The Space Stacks slot game gives you an opportunity to try something completely new in the online slots world (albeit in outer space). I’m pretty certain ReelBets will appear in future Push Gaming slots so it’s a good idea to get acquainted with it now.

The question is whether you will spread your bets equally amongst the various Blocks or wager more on the Feature or MAX Blocks. Space Stacks is similar to roulette where you choose where you think the ball will land on. You can choose a specific number or opt for even/odd numbers, first/second/third 12 numbers or more.

In summary, Push Gaming have created some totally unique in Space Stacks. It will take some time to get used to the mechanic/gameplay. What is for certain is that playing the demo is a must. That said, UK players not having Autoplay and Turbo Mode when playing for real money is a big disadvantage for this particular game.

If you prefer more conventional slots, Push Gaming have some superb options. The likes of Jammin’ Jars 2, Fat Rabbit and Razor Shark would be my picks.

If you’re a fan of outer space, NetEnt’s Starburst XXXtreme is the hyped version of the classic Starburst. With multipliers up to 450x, it comes with 200,000 x bet max wins.

Space Stacks FAQs

What is the Space Stacks RTP?

The average Space Stacks RTP rate is 96.23% which is higher than the average of 96%. Medium volatility, filling a column sees the RTP vary from 96.07% up to 96.39%.

What is the Space Stacks max win?

The max win per spin is 5,000 x your total bet. This can be won by filling the MAX Block column. The chances of winning the max amount is 1 in every 5,205 spins.

Are there any Space Stacks free spins?

No, the game is about placing bets on each column. You’ll then win the prize associated by filling the column with symbols/Blocks. This is called the ReelBets feature. You can expect Enhancements for bigger prizes and 3 bonus features.

Is there a Space Stacks demo?

Yes, the Space Stacks demo can be played here for free at Online-Slot.co.uk. Try this innovative video slot from Push Gaming on mobile, laptop, PC and/or tablet devices.

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