Stack 'Em

by Hacksaw Gaming

Stack 'Em is a charming 5x6 cluster pays slot developed by Hacksaw Gaming that sees Cuppy the Cup return in a slot that sees non-winning symbols removed from the game so that players can build stacks of winning symbols, building up increasing win multipliers to boost their bankroll. In addition to this players can trigger 5 free spins that see mystery '?' symbols boost an overall win multiplier allowing players to win up to 10,000x their stake.

Slot information

RTP: 96.20%
Volatility: High
Max Payout: 10,000x stake
Jackpot: No
Min Bet: 0.20
Max Bet: 100.00
Category: Grid slots
Theme: WTF
Release Date: 25th May 2021

Our rating

“ This cute and quirky slot is truly one-of-a-kind. ”

3.9 out of 5

Win potential

Play Stack 'Em

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Stack 'Em Screenshots

Stack 'Em Features

Stack 'Em is unique in the fact that it's a cluster paying slot that sees non-winning symbols removed from the game, not winning symbols. In addition to this multipliers grow whenever symbols stack on top of eachother on the reels... The higher the stack, the higher the base game wins!


After every winning cluster, non-winning symbols are removed from the game allowing for the winning ones to sit at the bottom of the grid. 

Below each reel is a multiplier value (starting out as a lock symbol), the win multiplier will coincide with how many matching symbols are above it... So if there are two G symbols making up a winning cluster on one row then that multiplier will be 2x.

All of the active multipliers are added together to make one large overall multiplier, any wins are then multiplied by this. This process will continue as long as players continue to achieve consecutive winning clusters.

Free Spins

If players manage to land 3 free spin symbols anywhere on the game grid then they'll automatically trigger 5 free spins. These free spins are displayed as hearts above the reels. This bonus will continue until no more hearts remain. 

Every winning spin will see the overall win multiplier increased based on how many winning symbols appear. 

During the free spins bonus, a special X symbol may land that can see all winning clusters connect and multiplied with the factor shown above the reels. 

There's also a ? symbol that will either award players additional free spins or increase the overall win multiplier. The following outcomes are as follows:

Stack 'Em - Multipliers


Individual win multipliers sit at the bottom of the game grid. If a winning cluster makes its way to the bottom of the grid multipliers will activate, all of the multipliers are added together and one large overall multiplier is applied to wins. 

Stack 'Em - Free Spins

Free Spins

If players land 3 scatter symbols on the game grid then they'll receive 5 free spins. Every winning spin will see a win multiplier increase based on the number of winning symbols that featured in that winning cluster.

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Stack 'Em Review

Canny the Can makes his triumphant return in Stack 'Em a 5x6 Cluster Pays slot that follows in the footsteps of Stick 'Em, the first-ever online slot ever released by Hacksaw Gaming. This truly bizarre game sees players tasked with stacking building block symbols on top of eachother to grow win multipliers below the reels as non-winning symbols are removed from the game completely. Players can win a maximum prize of 10,000x by way of a Free Spins bonus feature.  


This gorgeous game sees mascot Canny the Can joined by buddy Mona the Mouse in a beautiful tree-lined field somewhere out in the countryside. Both Canny and Mona stand excitedly on either side of the game reels looking chirpy and ready for action.

The game grid is made up of 30 wooden building blocks that feature letters and symbols. Low paying symbols are A, G, E, R and T (we don't know why they've picked these letters), high paying symbols include a leaf, a dead bird, a skull, a snake and a thumbs up. The wild symbol is a building block featuring a child's head and the word WILD stamped over it in orange letters. The game's scatter symbol is a block featuring the letters MS and Mona the Mouse.

A jovial, upbeat piano track plays throughout gameplay. It's cheery and fits the aesthetic of this slot perfectly... We guarantee it'll put a smile on your face. 


If players manage to land five matching symbols connected next to eachother then they'll win a cash payout. Stack 'Em differs from most standard cluster pays slots as the winning symbols remain in place whilst all of the non-winning symbols are removed from the game. Win multipliers at the bottom of the grid will increase if a winning cluster of symbols sits above them.

In terms of navigating the slot, everything can be found on a black action bar that runs along the bottom of the game screen. On the left-hand side of the action bar there's a hamburger menu that allows players access to the paytable, sound settings and turbo spins. On the right-hand side of the action bar there's a stake selection button, spin button and autospin button.

Win Potential

This high volatility slot has a decent RTP of 96.20% and can see players win a maximum of 10,000x their stake, which isn't bad at all. We found that the majority of our big wins came by way of the free spins feature, as a host of large winning clusters saw our overall win multiplier truly climb to dizzy heights. 

Our Verdict

Stack 'Em is a truly unique slot that looks fantastic and is a lot of fun to play. Whilst this slot isn't full to the brim with bonus features, the quirky mechanics and increasing win multipliers are more than enough to make up for that.

Sam Gascoyne
Reviewed by Sam Gascoyne Last updated on

A keen sports bettor, Sam took his first foray into the world of online slots when Bonanza Megaways caught his eye, he’s never looked back since! He joined the team in 2019 and has developed an encyclopedic knowledge of online slots, he isn’t afraid to voice his honest opinion when reviewing new games, even if it does ruffle a few feathers.

Learn more about Sam here

Play Stack 'Em

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