Stack ‘Em Slot Review

Technical Table Information

RTP (return to player)96.2%
Casino Software provider:Hacksaw Gaming
Release date14.05.2021
Maximum Multiplierx10000
Volatility: (low, medium, high) High
Winning Lines:Cluster Pays
Min bet: 0.2
Max bet: 100

Description of the Slot 

In Stack’ Em, Hacksaw Gaming has made a return with their famous character, Canny the Can. He is now being accompanied by Mona the Mouse that features on the left side of the slot machine. Following the success of its predecessor, Stick’ Em, Hacksaw Gaming has made several strides with the release of this new slot in 2021. Stack’ Em has several exciting features under its sleeve that make things both exciting and curious. So, without further ado, let us jump straight into the review of the slot. 

Design and Audio

For a 5×6 grid slot, Stack’ Em has invested a lot in its design. The game’s setting is in an idyllic landscape where you can stare at the mountains at the far distance. Set against this backdrop is a cluster of symbols that do not seem to bear a connection to one another and give the slot its eclectic appeal. 

If you are a fan of Jazz, you can hop on to this slot with Canny the Can, for the background still is a piece of Jazz music accompanied by bird calls. However, the audio does not help in any way in setting the mood of the slot. You can mute the game if they want. 


The true potential of Stack’ Em rests in its feature, and Hacksaw Gaming has made sure that we take out something substantial from it. Let us see what they are:

Cluster Pays 

To make a winning combination in this slot, you do not have to use the paylines in the traditional manner. Instead, all you have to do is get 5 or more matching symbols in a cluster that are joined vertically or horizontally. This feature is known as Cluster Pays. This implies that you can make a winning combination by using merely a single reel. 

If you make a cluster in the base game, the non-winning symbols are taken out from the grid and replaced by new ones. The winning cluster drops to the bottom of the reel. The process gets repeated as long as you are able to form a winning combination. The winning symbols under each reel turn in the multiplier. For instance, in a cluster that had 2 symbols from the first reel, the multiplier under the 1st reel would be 2x. 

It is important to note that the multipliers can only get to the highest value of 6x in each reel. So, the maximum you can get from this slot is 5 x 6 = 30x multiplier. 

Free Spins 

There are two ways to trigger the free spins in Stack’ Em. The first method follows the standard procedure where you will have to land 3 scatter symbols in a spin. This will give you 5 free spins depicted as hearts above the reels. Suppose you manage to land a cluster while the free spins feature is active. In that case, the win multiplier gets increased by the number of winning symbols in the cluster. For instance, if a cluster is made up of 8 symbols during the free spins feature, then the win multiplier will increase by +8. 

As for the second method, we will discuss it a bit later. 

‘X’ and ‘?’ Symbols 

You are quite likely to come across two symbols during the free spins round. If the ‘X’ symbol gets connected with your cluster, it will multiply your win by the total number of current multipliers on the screen. On the other hand, the appearance of the ‘?’ symbol can do one of the three following things: 

  • It can increase your free spins count by adding +2 to +5 hearts
  • Adds the value of 1-50 in the multiplier
  • It can even multiply the current multipliers by x2, x3, x4, or x5.  

Bonus Buy Feature 

Now, it is time to come to the second method to retrigger the free spins round. This is done by using the Bonus Buy feature. When you purchase the Bonus Buy feature, you can get straight to the free spins round without waiting for the scatter symbols to show up. To activate the Bonus Buy feature, you will have to pay 129x of your bet


As mentioned earlier, the symbols in Stack’ Em are made up of an odd collection. Moving from low-paying symbols to the high ones, we find them in the following order: A, G, E, R, T, a green leaf, a sleeping bird, a skull, a snake, and a thumbs-up sign. By forming a cluster of 25+ symbols, the lowest you can win is 25x of your stake, whereas the highest payout will be 200x of your bet. There is also a wild symbol in the game that can take the place of any other symbol except the free spins symbol. 


Stack’ Em has a group of melange characters that hold no apparent connection with one another. All we can say about the symbols and the setting is that they are literally stacked together, as the title of the slot would suggest.  


Stack’ Em is a highly volatile slot where the risks and returns are equally high. So, if you are getting your hands on this game, be prepared to risk it all, for you might have to wait a long while before a cluster can form. But once it does, the lucrative sum would be all yours for the taking. 

About the Game Provider 

Hacksaw Gaming still has a long journey to make in the igaming industry. But it is pretty surprising to see how much the company has improved over the course of its short journey. The game provider is known to craft scratch tickets and slots. Hacksaw Gaming has ensured that it operates under the guiding eye of authority. For this reason, they have duly got their license from the Malta Gaming Authority. How the company progresses will significantly impact the igaming industry in the coming years. 

Final Considerations 

Stack’ Em has made a name for itself in a very short time, which is unsurprising. The game mechanic is highly innovative and offers plenty of options one way or the other to get yourself to victory. With cluster pays and cascading symbols feature, Stack’ Em is a slot worth trying, even if only as one of the free slots. 

Other Slots by Hacksaw Gaming

  • My Lucky Number 
  • The Bomb
  • Miami Multiplier  

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