5 reels, 6 rows, cluster pays (5 or more connected symbols)
Bonus buy
Yes
Theme
neon blocks, arcade, bright shapes
Hacksaw games ship with several RTP builds and casinos pick one; the info page inside the game shows the figure you are on.
WHAT IT IS
Stack 'Em in short
Stack 'Em is a May 2021 cluster slot from Hacksaw Gaming with a 5 by 6 grid and one odd rule: when a cluster wins, the winning symbols do not vanish. They stay and stack on their reel, and everything else is cleared and replaced. Each reel's multiplier is the number of stacked symbols on it, so a reel that fills to six is 6x and a win across five full reels is 30x. The published RTP is 96.20% and the cap is 10,000x.
Canadians search for it because it does not play like the Pragmatic tumble games and because the free spins round, five spins only, can turn into something silly. The base game can pay up to 6,000x on its own by the published figure, which is more than most slots give you without a feature.
HOW IT PLAYS
Base game and symbols
Five or more matching symbols touching horizontally or vertically form a cluster. Here is the twist: instead of the winners being removed, the losers are. Non-winning symbols clear, new ones drop in, and the winning symbols sit where they are and start to stack up their reel. The sequence keeps going as long as new clusters form, and the stacks keep growing.
The multipliers come from the stacks. A reel with three stacked symbols is 3x, a full reel of six is 6x, and the multipliers from every reel in a win are added together, up to 30x on one win. So a cluster that spreads across four reels that each hold five symbols pays 20x. When the sequence ends and the next spin starts, everything resets.
Sequences are quick but a good one takes a while to play out, because each new cluster can clear and refill several times. On C$0.40 a spin a C$30 deposit gives you a real look at the mechanic. Most casino bonuses cap the stake at about C$5 to C$7 a spin and exclude the bonus buy, so the 129x buy, C$129 at C$1, is a real-money thing only.
Features
Winning symbols stay and stack on their reel; losers are cleared and replaced
Each reel's multiplier equals the number of stacked symbols on it, up to 6x per reel and 30x per win
Free spins: 3 scatters in one spin sequence give 5 spins with a global multiplier that grows by the size of each winning cluster
X symbols: a cluster touching an X gets the global multiplier
Question mark symbols add spins, add to the multiplier, or multiply it by 2x to 5x
Bonus buy at 129x stake
THE FEATURE
Bonus round
Three scatters landing during the same spin sequence give five free spins. Only five. The point is the global multiplier: every winning cluster adds its symbol count to it, so a seven-symbol cluster adds 7, and any cluster touching an X symbol is paid at the global figure. Question mark symbols do one of three things when they land: add two to five spins, add 1 to 50 to the global multiplier, or multiply the current multiplier by 2x, 3x, 4x or 5x. A round where a question mark hits 5x on a multiplier already at 60 is how the cap gets reached.
A dead bonus is five spins with two small clusters, a global multiplier of 11 and no X symbol near either win. It pays a handful of times your stake. On a 129x buy that is most of the money gone, and five spins leave no room for a slow start.
OUR TAKE
Should you play Stack 'Em?
Play it if you want a cluster game that is different from the candy grids and you like watching a stack build. The base game is more alive than most, and the bonus is short and sharp. Skip it if you want a long feature with time to recover; five spins is five spins. For Hacksaw cluster games with a bigger grid, Hop 'n' Pop runs 7 by 7, and if you want a Hacksaw game with a longer bonus, Chaos Crew is where the studio's fans usually point you.
WHERE TO PLAY
Stack 'Em at Canadian casinos
Sites on our list that carry Hacksaw Gaming games.
0 of 15
None of the 15 casinos on our list named Hacksaw Gaming before sign-up. That usually means the provider filter sits behind the registration wall, not that the game is missing. Our top three overall are below; search the lobby after you register and before you deposit.
8.6/10
#1 · Biggest CAD welcome pack
Rolling Slots
Biggest Canadian-dollar pack on our list, but it takes four deposits and the cashier is a mystery until you register.
WELCOME OFFER310% up to C$5,800+ 800 Free Spins
Good
Interac, Skrill and crypto with a C$20 minimum; Skrill and Bitcoin payouts in 0 to 2 days
3,000+ games including 200+ live tables, weekly reloads and 10% cashback
casino.guru Safety Index 9.4, fair terms, no unresolved complaints
Watch out
Withdrawals capped at C$750 a day and about C$15,000 a month
45x wagering on the welcome bonus, 7 days to clear it, table games count 0%
Trustpilot 2.4/5: payout waits of days to weeks and KYC taking around 5 days
After a winning cluster the winners stay put and every other symbol is cleared and replaced. The winning symbols pile up on their reel, and each reel's multiplier equals the number of symbols stacked on it, up to 6x. Multipliers from every reel in a win are added, up to 30x, and reset on the next spin.
02Can I play Stack 'Em with a casino bonus in Canada?
Usually, with the stake capped at about C$5 to C$7 a spin and the 129x bonus buy excluded while bonus money is active. Hacksaw games come in several RTP builds, so check the in-game info page; the 96.20% version is the one you want for wagering.
03Why does the bonus only give five spins?
Because the global multiplier is the point, not the spin count. Each cluster adds its size to the multiplier and the question mark symbols can add spins or multiply the total. A good round grows fast; a bad one is over before anything builds, which is why people find the game harsh.
RTP, max win and release date checked against slotcatalog.com in October 2026. Casinos can run a different RTP build; the game's own info page shows the one you are on.
CANADIAN CASINOS, CHECKED BY HAND
