Stack Em (Hacksaw Gaming) – Review & Demo Play

Reading Stack Em through a 90s Strip memory

Stack Em from Hacksaw Gaming is a 5x6 Cluster Pays slot built around stacked winning symbols, Cascading Reels, reel multipliers and a short Free Spins round. I read it as a follow-up to Stick Em, with Canny the Can and Mona the Mouse returning in a cleaner, sharper slot format. This is a cleaner era of play, all screens and no levers.

Digital control changes the feel. Back on the Strip, the reel machines carried a different weight, and I still measure new slots against that physical pace. Here, the interface does in a tap what once took a full pull of the arm. This is a modern take on a game I have known for decades, but the grid logic is plainly current.

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By the numbers on Stack Em

Numbers give Stack Em its clearest identity. The top RTP is 96.2%, with lower versions down to 94.25% in some settings, and the volatility is high. The RTP at 96.2% would have been called generous on those floors, yet the payout logic feels tamer than the floors I remember because every risk sits inside disclosed maths.

High variance is not decorative here. The volatility here runs high, much like the machines that emptied fast back then, and the 10,000x top win sits above a base-game ceiling reported at 6,000x. I judge the max win of 5,000x against the jackpots I once chased in person is a phrase for milder slots; this one demands a 10,000x standard.

Reading the paytable

Paytable structure is direct, but not plain. Wins need clusters of five or more matching symbols connected horizontally or vertically. The Wild substitutes for regular pay symbols, while the Scatter carries the Free Spins trigger. The thumbs-up symbol is the top regular icon, paying up to x200 for 25 or more in a cluster, ahead of the leaf, dead bird, skull and snake.

Letter symbols A, G, E, R and T sit at the lower end and can still reach x25 for 25 or more. I like that the winning symbols stay after a hit while the non-winning symbols are removed, because it gives the reel multipliers a visible basis. The hit rate feels engineered where the old floors felt raw, but the cause and effect is readable.

Symbols and payouts

Thumbs-up

Highest-paying regular symbol, paying up to x200 for a cluster of 25 or more.

25+	x200
20-24	x100
15-19	x30
13-14	x10
11-12	x6
9-10	x4
7-8	x2
5-6	x0.5

Leaf

High-paying regular symbol with a top cluster payout of x100 for 25 or more.

25+	x100
20-24	x50
15-19	x20
13-14	x5
11-12	x3
9-10	x2
7-8	x1
5-6	x0.25

Dead Bird

High-paying regular symbol with a top cluster payout of x100 for 25 or more.

25+	x100
20-24	x50
15-19	x20
13-14	x5
11-12	x3
9-10	x2
7-8	x1
5-6	x0.25

Skull

High-paying regular symbol with a top cluster payout of x100 for 25 or more.

25+	x100
20-24	x50
15-19	x20
13-14	x5
11-12	x3
9-10	x2
7-8	x1
5-6	x0.25

Snake

High-paying regular symbol with a top cluster payout of x100 for 25 or more.

25+	x100
20-24	x50
15-19	x20
13-14	x5
11-12	x3
9-10	x2
7-8	x1
5-6	x0.25

A

Low-paying regular symbol with a top cluster payout of x25 for 25 or more.

25+	x25
20-24	x12.5
15-19	x4
13-14	x1
11-12	x0.6
9-10	x0.4
7-8	x0.2
5-6	x0.1

G

Low-paying regular symbol with a top cluster payout of x25 for 25 or more.

25+	x25
20-24	x12.5
15-19	x4
13-14	x1
11-12	x0.6
9-10	x0.4
7-8	x0.2
5-6	x0.1

E

Low-paying regular symbol with a top cluster payout of x25 for 25 or more.

25+	x25
20-24	x12.5
15-19	x4
13-14	x1
11-12	x0.6
9-10	x0.4
7-8	x0.2
5-6	x0.1

R

Low-paying regular symbol with a top cluster payout of x25 for 25 or more.

25+	x25
20-24	x12.5
15-19	x4
13-14	x1
11-12	x0.6
9-10	x0.4
7-8	x0.2
5-6	x0.1

T

Low-paying regular symbol with a top cluster payout of x25 for 25 or more.

25+	x25
20-24	x12.5
15-19	x4
13-14	x1
11-12	x0.6
9-10	x0.4
7-8	x0.2
5-6	x0.1

Scatter

Three Scatters trigger the Free Spins round during the same cascading sequence.

Wild

Replaces all regular paying symbols but does not replace the Scatter.

X

Applies the current global multiplier to winning clusters adjacent to it during Free Spins.

Question Mark

Adds 2 to 5 free spins, adds 1 to 50 to the global multiplier, or multiplies the current multiplier by x2, x3, x4 or x5.

Bonus phases of Stack Em

Bonuses define the game. Three Scatters during the same cascading sequence award five free spins, shown as hearts above the grid. Veterans of that era will recognise the pull of a proper bonus, although the free spins land far less often than the old three-reelers did. Once inside, the bonus round carries the tension I used to queue up for.

Multiplier growth is the reason to care. The global multiplier rises by the number of symbols in each winning cluster, but only wins adjacent to the X symbol receive that multiplier. The Question Mark symbol can add 2 to 5 free spins, add 1 to 50 to the multiplier, or multiply the current multiplier by x2, x3, x4 or x5.

Buying the feature costs 129x the stake where Bonus Buy is available, though UK players should not expect that option in regulated play. The feature trigger keeps a rhythm the old cabinets never managed, because Scatters can arrive within the same cascade chain. My main criticism is precise: five starting hearts can disappear before a useful X connection appears.

Bonus features

Free Spins

Triggered by 3 Scatter symbols during the same cascading sequence, awarding 5 free spins with a global multiplier that increases by the number of symbols in each winning cluster. X symbols apply the current global multiplier to adjacent winning clusters, while Question Mark symbols can add free spins, add multiplier value, or multiply the current multiplier.

RTP: 96.2% Volatility: High

Bonus Buy

The Free Spins round can be bought directly for 129x the stake where the feature is permitted. The Bonus Buy version uses a stated RTP of 96.2%.

Feature Cost: 129x RTP: 96.2% Volatility: High

Gallery of video and screenshots of the game